diff --git a/.travis.yml b/.travis.yml
index 54799362a..155ac012d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,9 +27,9 @@ matrix:
     - compiler: "true 1"
       env: HOST=arm-linux-gnueabihf PACKAGES="g++-arm-linux-gnueabihf" DEP_OPTS="NO_QT=1" GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat"
     - compiler: "true 2"
-      env: HOST=x86_64-unknown-linux-gnu DEP_OPTS="NO_QT=1 NO_WALLET=1 NO_UPNP=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat CPPFLAGS=-DDEBUG_LOCKORDER"
+      env: HOST=x86_64-unknown-linux-gnu DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat CPPFLAGS=-DDEBUG_LOCKORDER"
     - compiler: "true 3"
-      env: HOST=x86_64-unknown-linux-gnu RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat"
+      env: HOST=x86_64-unknown-linux-gnu DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat"
     - compiler: "true 4"
       env: HOST=i686-pc-linux-gnu PACKAGES="g++-multilib" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat"
     - compiler: "true 5"
diff --git a/depends/Makefile b/depends/Makefile
index f5fb5b865..fc763bede 100644
--- a/depends/Makefile
+++ b/depends/Makefile
@@ -22,6 +22,12 @@ host:=$(HOST)
 host_toolchain:=$(HOST)-
 endif
 
+ifneq ($(DEBUG),)
+release_type=debug
+else
+release_type=release
+endif
+
 base_build_dir=$(BASEDIR)/work/build
 base_staging_dir=$(BASEDIR)/work/staging
 canonical_host:=$(shell ./config.sub $(HOST))
@@ -103,12 +109,14 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@STRIP@|$(toolchain_path)$(host_STRIP)|' \
             -e 's|@build_os@|$(build_os)|' \
             -e 's|@host_os@|$(host_os)|' \
-            -e 's|@CFLAGS@|$(host_CFLAGS)|' \
-            -e 's|@CXXFLAGS@|$(host_CXXFLAGS)|' \
-            -e 's|@LDFLAGS@|$(host_LDFLAGS)|' \
+            -e 's|@CFLAGS@|$(strip $(host_CFLAGS) $(host_$(release_type)_CFLAGS))|' \
+            -e 's|@CXXFLAGS@|$(strip $(host_CXXFLAGS) $(host_$(release_type)_CXXFLAGS))|' \
+            -e 's|@CPPFLAGS@|$(strip $(host_CPPFLAGS) $(host_$(release_type)_CPPFLAGS))|' \
+            -e 's|@LDFLAGS@|$(strip $(host_LDFLAGS) $(host_$(release_type)_LDFLAGS))|' \
             -e 's|@no_qt@|$(NO_QT)|' \
             -e 's|@no_wallet@|$(NO_WALLET)|' \
             -e 's|@no_upnp@|$(NO_UPNP)|' \
+            -e 's|@debug@|$(DEBUG)|' \
             $< > $@
 	$(AT)touch $@
 
diff --git a/depends/README.packages b/depends/README.packages
index c35abfbdc..5ab7ed7de 100644
--- a/depends/README.packages
+++ b/depends/README.packages
@@ -65,10 +65,22 @@ These variables may be set to override or append their default values.
   $(package)_config_env
   $(package)_build_env
   $(package)_stage_env
+  $(package)_build_opts
+  $(package)_config_opts
 
 The *_env variables are used to add environment variables to the respective
 commands.
 
+Many variables respect a debug/release suffix as well, in order to use them for
+only the appropriate build config. For example:
+  $(package)_cflags_release = -O3
+  $(package)_cflags_i686_debug = -g
+  $(package)_config_opts_release = --disable-debug
+
+These will be used in addition to the options that do not specify
+debug/release. All builds are considered to be release unless DEBUG=1 is set by
+the user.
+
 Other variables may be defined as needed.
 
 Build commands:
diff --git a/depends/README.usage b/depends/README.usage
index 0aacefbf9..d3c57956f 100644
--- a/depends/README.usage
+++ b/depends/README.usage
@@ -22,6 +22,7 @@ FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before givin
 NO_QT: Don't download/build/cache qt and its dependencies
 NO_WALLET: Don't download/build/cache libs needed to enable the wallet
 NO_UPNP: Don't download/build/cache packages needed for enabling upnp
+DEBUG: disable some optimizations and enable more runtime checking
 
 If some packages are not built, for example 'make NO_WALLET=1', the appropriate
 options will be passed to bitcoin's configure. In this case, --disable-wallet.
diff --git a/depends/config.site.in b/depends/config.site.in
index 1df04eec3..3426050cd 100644
--- a/depends/config.site.in
+++ b/depends/config.site.in
@@ -52,7 +52,9 @@ export PATH=$prefix/native/bin:$PATH
 export PKG_CONFIG="`which pkg-config` --static"
 export PKG_CONFIG_LIBDIR=$prefix/lib/pkgconfig
 export PKG_CONFIG_PATH=$prefix/share/pkgconfig
+
 export CPPFLAGS="-I$prefix/include/ $CPPFLAGS"
+export LDFLAGS="-L$prefix/lib $LDFLAGS"
 
 export CC="@CC@"
 export CXX="@CXX@"
@@ -75,10 +77,19 @@ if test -n "@NM@"; then
   ac_cv_path_ac_pt_NM=${NM}
 fi
 
+if test -n "@debug@"; then
+  enable_reduce_exports=no
+fi
+
 if test -n "@CFLAGS@"; then
   export CFLAGS="@CFLAGS@ $CFLAGS"
 fi
 if test -n "@CXXFLAGS@"; then
   export CXXFLAGS="@CXXFLAGS@ $CXXFLAGS"
 fi
-export LDFLAGS="-L$prefix/lib @LDFLAGS@ $LDFLAGS"
+if test -n "@CPPFLAGS@"; then
+  export CPPFLAGS="@CPPFLAGS@ $CPPFLAGS"
+fi
+if test -n "@LDFLAGS@"; then
+  export LDFLAGS="@LDFLAGS@ $LDFLAGS"
+fi
diff --git a/depends/funcs.mk b/depends/funcs.mk
index 28bfb8549..c1fc0a0e3 100644
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@@ -8,10 +8,10 @@ $(1)_ar=$($($(1)_type)_AR)
 $(1)_ranlib=$($($(1)_type)_RANLIB)
 $(1)_libtool=$($($(1)_type)_LIBTOOL)
 $(1)_nm=$($($(1)_type)_NM)
-$(1)_cflags=$($($(1)_type)_CFLAGS)
-$(1)_cxxflags=$($($(1)_type)_CXXFLAGS)
-$(1)_ldflags=$($($(1)_type)_LDFLAGS) -L$($($(1)_type)_prefix)/lib
-$(1)_cppflags:=-I$($($(1)_type)_prefix)/include
+$(1)_cflags=$($($(1)_type)_CFLAGS) $($($(1)_type)_$(release_type)_CFLAGS)
+$(1)_cxxflags=$($($(1)_type)_CXXFLAGS) $($($(1)_type)_$(release_type)_CXXFLAGS)
+$(1)_ldflags=$($($(1)_type)_LDFLAGS) $($($(1)_type)_$(release_type)_LDFLAGS) -L$($($(1)_type)_prefix)/lib
+$(1)_cppflags=$($($(1)_type)_CPPFLAGS) $($($(1)_type)_$(release_type)_CPPFLAGS) -I$($($(1)_type)_prefix)/include
 $(1)_recipe_hash:=
 endef
 
@@ -38,7 +38,7 @@ define int_get_build_id
 $(eval $(1)_dependencies += $($(1)_$(host_arch)_$(host_os)_dependencies) $($(1)_$(host_os)_dependencies))
 $(eval $(1)_all_dependencies:=$(call int_get_all_dependencies,$(1),$($($(1)_type)_native_toolchain) $($(1)_dependencies)))
 $(foreach dep,$($(1)_all_dependencies),$(eval $(1)_build_id_deps+=$(dep)-$($(dep)_version)-$($(dep)_recipe_hash)))
-$(eval $(1)_build_id_long:=$(1)-$($(1)_version)-$($(1)_recipe_hash) $($(1)_build_id_deps))
+$(eval $(1)_build_id_long:=$(1)-$($(1)_version)-$($(1)_recipe_hash)-$(release_type) $($(1)_build_id_deps))
 $(eval $(1)_build_id:=$(shell echo -n "$($(1)_build_id_long)" | $(build_SHA256SUM) | cut -c-$(HASH_LENGTH)))
 final_build_id_long+=$($(package)_build_id_long)
 
@@ -83,33 +83,40 @@ endef
 
 define int_config_attach_build_config
 $(eval $(call $(1)_set_vars,$(1)))
-$(1)_cflags+=$($(1)_cflags_$(host_arch))
-$(1)_cflags+=$($(1)_cflags_$(host_os))
-$(1)_cflags+=$($(1)_cflags_$(host_arch)_$(host_os))
-
-$(1)_cxxflags+=$($(1)_cxxflags_$(host_arch))
-$(1)_cxxflags+=$($(1)_cxxflags_$(host_os))
-$(1)_cxxflags+=$($(1)_cxxflags_$(host_arch)_$(host_os))
-
-$(1)_cppflags+=$($(1)_cppflags_$(host_arch))
-$(1)_cppflags+=$($(1)_cppflags_$(host_os))
-$(1)_cppflags+=$($(1)_cppflags_$(host_arch)_$(host_os))
-
-$(1)_ldflags+=$($(1)_ldflags_$(host_arch))
-$(1)_ldflags+=$($(1)_ldflags_$(host_os))
-$(1)_ldflags+=$($(1)_ldflags_$(host_arch)_$(host_os))
-
-$(1)_build_opts+=$$($(1)_build_opts_$(host_arch))
-$(1)_build_opts+=$$($(1)_build_opts_$(host_os))
-$(1)_build_opts+=$$($(1)_build_opts_$(host_arch)_$(host_os))
-
-$(1)_config_opts+=$$($(1)_config_opts_$(host_arch))
-$(1)_config_opts+=$$($(1)_config_opts_$(host_os))
-$(1)_config_opts+=$$($(1)_config_opts_$(host_arch)_$(host_os))
-
-$(1)_config_env+=$($(1)_config_env_$(host_arch))
-$(1)_config_env+=$($(1)_config_env_$(host_os))
-$(1)_config_env+=$($(1)_config_env_$(host_arch)_$(host_os))
+$(1)_cflags+=$($(1)_cflags_$(release_type))
+$(1)_cflags+=$($(1)_cflags_$(host_arch)) $($(1)_cflags_$(host_arch)_$(release_type))
+$(1)_cflags+=$($(1)_cflags_$(host_os)) $($(1)_cflags_$(host_os)_$(release_type))
+$(1)_cflags+=$($(1)_cflags_$(host_arch)_$(host_os)) $($(1)_cflags_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_cxxflags+=$($(1)_cxxflags_$(release_type))
+$(1)_cxxflags+=$($(1)_cxxflags_$(host_arch)) $($(1)_cxxflags_$(host_arch)_$(release_type))
+$(1)_cxxflags+=$($(1)_cxxflags_$(host_os)) $($(1)_cxxflags_$(host_os)_$(release_type))
+$(1)_cxxflags+=$($(1)_cxxflags_$(host_arch)_$(host_os)) $($(1)_cxxflags_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_cppflags+=$($(1)_cppflags_$(release_type))
+$(1)_cppflags+=$($(1)_cppflags_$(host_arch)) $($(1)_cppflags_$(host_arch)_$(release_type))
+$(1)_cppflags+=$($(1)_cppflags_$(host_os)) $($(1)_cppflags_$(host_os)_$(release_type))
+$(1)_cppflags+=$($(1)_cppflags_$(host_arch)_$(host_os)) $($(1)_cppflags_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_ldflags+=$($(1)_ldflags_$(release_type))
+$(1)_ldflags+=$($(1)_ldflags_$(host_arch)) $($(1)_ldflags_$(host_arch)_$(release_type))
+$(1)_ldflags+=$($(1)_ldflags_$(host_os)) $($(1)_ldflags_$(host_os)_$(release_type))
+$(1)_ldflags+=$($(1)_ldflags_$(host_arch)_$(host_os)) $($(1)_ldflags_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_build_opts+=$$($(1)_build_opts_$(release_type))
+$(1)_build_opts+=$$($(1)_build_opts_$(host_arch)) $$($(1)_build_opts_$(host_arch)_$(release_type))
+$(1)_build_opts+=$$($(1)_build_opts_$(host_os)) $$($(1)_build_opts_$(host_os)_$(release_type))
+$(1)_build_opts+=$$($(1)_build_opts_$(host_arch)_$(host_os)) $$($(1)_build_opts_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_config_opts+=$$($(1)_config_opts_$(release_type))
+$(1)_config_opts+=$$($(1)_config_opts_$(host_arch)) $$($(1)_config_opts_$(host_arch)_$(release_type))
+$(1)_config_opts+=$$($(1)_config_opts_$(host_os)) $$($(1)_config_opts_$(host_os)_$(release_type))
+$(1)_config_opts+=$$($(1)_config_opts_$(host_arch)_$(host_os)) $$($(1)_config_opts_$(host_arch)_$(host_os)_$(release_type))
+
+$(1)_config_env+=$$($(1)_config_env_$(release_type))
+$(1)_config_env+=$($(1)_config_env_$(host_arch)) $($(1)_config_env_$(host_arch)_$(release_type))
+$(1)_config_env+=$($(1)_config_env_$(host_os)) $($(1)_config_env_$(host_os)_$(release_type))
+$(1)_config_env+=$($(1)_config_env_$(host_arch)_$(host_os)) $($(1)_config_env_$(host_arch)_$(host_os)_$(release_type))
 
 $(1)_config_env+=PKG_CONFIG_LIBDIR=$($($(1)_type)_prefix)/lib/pkgconfig
 $(1)_config_env+=PKG_CONFIG_PATH=$($($(1)_type)_prefix)/share/pkgconfig
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
index 9e2415655..8d718eba1 100644
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@@ -3,6 +3,14 @@ OSX_SDK_VERSION=10.7
 OSX_SDK=$(SDK_PATH)/MacOSX$(OSX_SDK_VERSION).sdk
 darwin_CC=clang -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK)
 darwin_CXX=clang++ -target $(host) -mmacosx-version-min=$(OSX_MIN_VERSION) --sysroot $(OSX_SDK)
-darwin_CFLAGS=-pipe -O2
+
+darwin_CFLAGS=-pipe
 darwin_CXXFLAGS=$(darwin_CFLAGS)
+
+darwin_release_CFLAGS=-O2
+darwin_release_CXXFLAGS=$(darwin_release_CFLAGS)
+
+darwin_debug_CFLAGS=-O1
+darwin_debug_CXXFLAGS=$(darwin_debug_CFLAGS)
+
 darwin_native_toolchain=native_cctools
diff --git a/depends/hosts/default.mk b/depends/hosts/default.mk
index b9fe5d858..6f60d6b3f 100644
--- a/depends/hosts/default.mk
+++ b/depends/hosts/default.mk
@@ -11,13 +11,16 @@ default_host_NM = $(host_toolchain)nm
 define add_host_tool_func
 $(host_os)_$1?=$$(default_host_$1)
 $(host_arch)_$(host_os)_$1?=$$($(host_os)_$1)
+$(host_arch)_$(host_os)_$(release_type)_$1?=$$($(host_os)_$1)
 host_$1=$$($(host_arch)_$(host_os)_$1)
 endef
 
 define add_host_flags_func
 $(host_arch)_$(host_os)_$1 += $($(host_os)_$1)
+$(host_arch)_$(host_os)_$(release_type)_$1 += $($(host_os)_$(release_type)_$1)
 host_$1 = $$($(host_arch)_$(host_os)_$1)
+host_$(release_type)_$1 = $$($(host_arch)_$(host_os)_$(release_type)_$1)
 endef
 
 $(foreach tool,CC CXX AR RANLIB STRIP NM LIBTOOL OTOOL INSTALL_NAME_TOOL,$(eval $(call add_host_tool_func,$(tool))))
-$(foreach flags,CFLAGS CXXFLAGS LDFLAGS, $(eval $(call add_host_flags_func,$(flags))))
+$(foreach flags,CFLAGS CXXFLAGS CPPFLAGS LDFLAGS, $(eval $(call add_host_flags_func,$(flags))))
diff --git a/depends/hosts/linux.mk b/depends/hosts/linux.mk
index 194d71d55..b13a0f1ad 100644
--- a/depends/hosts/linux.mk
+++ b/depends/hosts/linux.mk
@@ -1,6 +1,14 @@
-linux_CFLAGS=-pipe -O2
+linux_CFLAGS=-pipe
 linux_CXXFLAGS=$(linux_CFLAGS)
 
+linux_release_CFLAGS=-O2
+linux_release_CXXFLAGS=$(linux_release_CFLAGS)
+
+linux_debug_CFLAGS=-O1
+linux_debug_CXXFLAGS=$(linux_debug_CFLAGS)
+
+linux_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
+
 ifeq (86,$(findstring 86,$(build_arch)))
 i686_linux_CC=gcc -m32
 i686_linux_CXX=g++ -m32
diff --git a/depends/hosts/mingw32.mk b/depends/hosts/mingw32.mk
index ffe4a5584..dbfb62fdc 100644
--- a/depends/hosts/mingw32.mk
+++ b/depends/hosts/mingw32.mk
@@ -1,2 +1,10 @@
-mingw32_CFLAGS=-pipe -O2
+mingw32_CFLAGS=-pipe
 mingw32_CXXFLAGS=$(mingw32_CFLAGS)
+
+mingw32_release_CFLAGS=-O2
+mingw32_release_CXXFLAGS=$(mingw32_release_CFLAGS)
+
+mingw32_debug_CFLAGS=-O1
+mingw32_debug_CXXFLAGS=$(mingw32_debug_CFLAGS)
+
+mingw32_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
diff --git a/depends/packages/boost.mk b/depends/packages/boost.mk
index a3cacbcbb..98ed3de77 100644
--- a/depends/packages/boost.mk
+++ b/depends/packages/boost.mk
@@ -6,8 +6,10 @@ $(package)_sha256_hash=fff00023dd79486d444c8e29922f4072e1d451fc5a4d2b6075852ead7
 $(package)_patches=darwin_boost_atomic-1.patch darwin_boost_atomic-2.patch
 
 define $(package)_set_vars
+$(package)_config_opts_release=variant=release
+$(package)_config_opts_debug=variant=debug
 $(package)_config_opts=--layout=tagged --build-type=complete --user-config=user-config.jam
-$(package)_config_opts+=variant=release threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
+$(package)_config_opts+=threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
 $(package)_config_opts_linux=threadapi=pthread runtime-link=shared
 $(package)_config_opts_darwin=--toolset=darwin-4.2.1 runtime-link=shared
 $(package)_config_opts_mingw32=binary-format=pe target-os=windows threadapi=win32 runtime-link=static
@@ -26,7 +28,7 @@ endef
 define $(package)_preprocess_cmds
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-1.patch && \
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-2.patch && \
-  echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
+  echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags) $($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
 endef
 
 define $(package)_config_cmds
diff --git a/depends/packages/miniupnpc.mk b/depends/packages/miniupnpc.mk
index 30f2d3f31..00101f1b9 100644
--- a/depends/packages/miniupnpc.mk
+++ b/depends/packages/miniupnpc.mk
@@ -8,7 +8,7 @@ define $(package)_set_vars
 $(package)_build_opts=CC="$($(package)_cc)"
 $(package)_build_opts_darwin=OS=Darwin
 $(package)_build_opts_mingw32=-f Makefile.mingw
-$(package)_build_env+=CFLAGS="$($(package)_cflags)" AR="$($(package)_ar)"
+$(package)_build_env+=CFLAGS="$($(package)_cflags) $($(package)_cppflags)" AR="$($(package)_ar)"
 endef
 
 define $(package)_preprocess_cmds
diff --git a/depends/packages/openssl.mk b/depends/packages/openssl.mk
index b1dcc6f81..3ccdaf6f2 100644
--- a/depends/packages/openssl.mk
+++ b/depends/packages/openssl.mk
@@ -9,7 +9,7 @@ $(package)_config_env=AR="$($(package)_ar)" RANLIB="$($(package)_ranlib)" CC="$(
 $(package)_config_opts=--prefix=$(host_prefix) --openssldir=$(host_prefix)/etc/openssl no-zlib no-shared no-dso
 $(package)_config_opts+=no-krb5 no-camellia no-capieng no-cast no-cms no-dtls1 no-gost no-gmp no-heartbeats no-idea no-jpake no-md2
 $(package)_config_opts+=no-mdc2 no-rc5 no-rdrand no-rfc3779 no-rsax no-sctp no-seed no-sha0 no-static_engine no-whirlpool no-rc2 no-rc4 no-ssl3
-$(package)_config_opts+=$($(package)_cflags)
+$(package)_config_opts+=$($(package)_cflags) $($(package)_cppflags)
 $(package)_config_opts_x86_64_linux=-fPIC linux-x86_64
 $(package)_config_opts_arm_linux=-fPIC linux-generic32
 $(package)_config_opts_x86_64_darwin=darwin64-x86_64-cc
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index e719e2e50..5fbab57dd 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -10,8 +10,9 @@ $(package)_qt_libs=corelib network widgets gui plugins testlib
 $(package)_patches=mac-qmake.conf fix-xcb-include-order.patch qt5-tablet-osx.patch
 
 define $(package)_set_vars
-$(package)_config_opts  = -release -opensource -confirm-license
-$(package)_config_opts += -no-audio-backend -no-sql-tds -no-glib -no-icu
+$(package)_config_opts_release = -release
+$(package)_config_opts_debug   = -debug
+$(package)_config_opts += -opensource -confirm-license -no-audio-backend -no-sql-tds -no-glib -no-icu
 $(package)_config_opts += -no-cups -no-iconv -no-gif -no-audio-backend -no-freetype
 $(package)_config_opts += -no-sql-sqlite -no-nis -no-cups -no-iconv -no-pch
 $(package)_config_opts += -no-gif -no-feature-style-plastique
@@ -53,7 +54,13 @@ define $(package)_preprocess_cmds
   cp -f qtbase/mkspecs/macx-clang/qplatformdefs.h qtbase/mkspecs/macx-clang-linux/ &&\
   cp -f $($(package)_patch_dir)/mac-qmake.conf qtbase/mkspecs/macx-clang-linux/qmake.conf && \
   patch -p1 < $($(package)_patch_dir)/fix-xcb-include-order.patch && \
-  patch -p1 < $($(package)_patch_dir)/qt5-tablet-osx.patch
+  patch -p1 < $($(package)_patch_dir)/qt5-tablet-osx.patch && \
+  echo "QMAKE_CFLAGS     += $($(package)_cflags) $($(package)_cppflags)" >> qtbase/mkspecs/common/gcc-base.conf && \
+  echo "QMAKE_CXXFLAGS   += $($(package)_cxxflags) $($(package)_cppflags)" >> qtbase/mkspecs/common/gcc-base.conf && \
+  echo "QMAKE_LFLAGS     += $($(package)_ldflags)" >> qtbase/mkspecs/common/gcc-base.conf && \
+  sed -i.old "s|QMAKE_CFLAGS            = |QMAKE_CFLAGS            = $($(package)_cflags) $($(package)_cppflags) |" qtbase/mkspecs/win32-g++/qmake.conf && \
+  sed -i.old "s|QMAKE_LFLAGS            = |QMAKE_LFLAGS            = $($(package)_ldflags) |" qtbase/mkspecs/win32-g++/qmake.conf && \
+  sed -i.old "s|QMAKE_CXXFLAGS          = |QMAKE_CXXFLAGS            = $($(package)_cxxflags) $($(package)_cppflags) |" qtbase/mkspecs/win32-g++/qmake.conf
 endef
 
 define $(package)_config_cmds
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index d742fb9eb..a71f55dd2 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -839,7 +839,8 @@ public:
                 itBegin = it;
             }
         }
-        s.write((char*)&itBegin[0], it-itBegin);
+        if (itBegin != scriptCode.end())
+            s.write((char*)&itBegin[0], it-itBegin);
     }
 
     /** Serialize an input of txTo */
diff --git a/src/test/getarg_tests.cpp b/src/test/getarg_tests.cpp
index 8cadcdd71..8a984304f 100644
--- a/src/test/getarg_tests.cpp
+++ b/src/test/getarg_tests.cpp
@@ -16,7 +16,8 @@ BOOST_AUTO_TEST_SUITE(getarg_tests)
 static void ResetArgs(const std::string& strArg)
 {
     std::vector<std::string> vecArg;
-    boost::split(vecArg, strArg, boost::is_space(), boost::token_compress_on);
+    if (strArg.size())
+      boost::split(vecArg, strArg, boost::is_space(), boost::token_compress_on);
 
     // Insert dummy executable name:
     vecArg.insert(vecArg.begin(), "testbitcoin");