diff --git a/contrib/gitian-descriptors/boost-win.yml b/contrib/gitian-descriptors/boost-win.yml
index db5d6bab1..347952e3a 100644
--- a/contrib/gitian-descriptors/boost-win.yml
+++ b/contrib/gitian-descriptors/boost-win.yml
@@ -29,7 +29,7 @@ script: |
     #
     INSTALLPREFIX=$HOME/staging${BITS}
     BUILDDIR=$HOME/build${BITS}
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       HOST=i686-w64-mingw32
     else
       HOST=x86_64-w64-mingw32
diff --git a/contrib/gitian-descriptors/deps-win.yml b/contrib/gitian-descriptors/deps-win.yml
index fabc2949e..fe02950ef 100644
--- a/contrib/gitian-descriptors/deps-win.yml
+++ b/contrib/gitian-descriptors/deps-win.yml
@@ -39,7 +39,7 @@ script: |
     #
     INSTALLPREFIX=$HOME/staging${BITS}
     BUILDDIR=$HOME/build${BITS}
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       HOST=i686-w64-mingw32
     else
       HOST=x86_64-w64-mingw32
@@ -50,7 +50,7 @@ script: |
     #
     tar xzf $INDIR/openssl-1.0.1h.tar.gz
     cd openssl-1.0.1h
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       OPENSSL_TGT=mingw
     else
       OPENSSL_TGT=mingw64
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index 245f15cca..b2795c537 100644
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -50,7 +50,7 @@ script: |
     STAGING=$HOME/staging${BITS}
     BUILDDIR=$HOME/build${BITS}
     BINDIR=$OUTDIR/$BITS
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       HOST=i686-w64-mingw32
     else
       HOST=x86_64-w64-mingw32
@@ -63,7 +63,7 @@ script: |
     unzip $INDIR/boost-win${BITS}-1.55.0-gitian-r6.zip
     unzip $INDIR/bitcoin-deps-win${BITS}-gitian-r13.zip
     unzip $INDIR/protobuf-win${BITS}-2.5.0-gitian-r4.zip
-    if [ "$NEEDDIST" == "1" ]; then
+    if [ "x$NEEDDIST" = "x1" ]; then
       # Make source code archive which is architecture independent so it only needs to be done once
       cd $HOME/build/bitcoin
       ./autogen.sh
diff --git a/contrib/gitian-descriptors/protobuf-win.yml b/contrib/gitian-descriptors/protobuf-win.yml
index d2fdcaa7f..1b7af0884 100644
--- a/contrib/gitian-descriptors/protobuf-win.yml
+++ b/contrib/gitian-descriptors/protobuf-win.yml
@@ -26,7 +26,7 @@ script: |
     #
     INSTALLPREFIX=$HOME/staging${BITS}
     BUILDDIR=$HOME/build${BITS}
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       HOST=i686-w64-mingw32
     else
       HOST=x86_64-w64-mingw32
diff --git a/contrib/gitian-descriptors/qt-linux.yml b/contrib/gitian-descriptors/qt-linux.yml
index b163b4bb8..fd86b4df1 100644
--- a/contrib/gitian-descriptors/qt-linux.yml
+++ b/contrib/gitian-descriptors/qt-linux.yml
@@ -18,7 +18,7 @@ files:
 script: |
   export FAKETIME=$REFERENCE_DATETIME
   export TZ=UTC
-  if [ "$GBUILD_BITS" == "32" ]; then
+  if [ "x$GBUILD_BITS" = "x32" ]; then
     ARCH='i386-linux-gnu'
   else
     ARCH='x86_64-linux-gnu'
@@ -74,7 +74,7 @@ script: |
   #endif
   ' > $QCONFIG
 
-  if [ "$GBUILD_BITS" == "32" ]; then
+  if [ "x$GBUILD_BITS" = "x32" ]; then
     echo '
   /* Machine byte-order */
   #define Q_BIG_ENDIAN 4321
diff --git a/contrib/gitian-descriptors/qt-win.yml b/contrib/gitian-descriptors/qt-win.yml
index 7000c7005..57bc4c318 100644
--- a/contrib/gitian-descriptors/qt-win.yml
+++ b/contrib/gitian-descriptors/qt-win.yml
@@ -38,7 +38,7 @@ script: |
     INSTALLPREFIX=$HOME/staging${BITS}
     BUILDDIR=$HOME/build${BITS}
     DEPSDIR=$HOME/deps${BITS}
-    if [ "$BITS" == "32" ]; then
+    if [ "x$BITS" = "x32" ]; then
       HOST=i686-w64-mingw32
     else
       HOST=x86_64-w64-mingw32
diff --git a/depends/config.site.in b/depends/config.site.in
index 3426050cd..df076956b 100644
--- a/depends/config.site.in
+++ b/depends/config.site.in
@@ -34,12 +34,12 @@ if test -z $with_gui && test -n "@no_qt@"; then
   with_gui=no
 fi
 
-if test @host_os@ == darwin; then
+if test x@host_os@ = xdarwin; then
   BREW=no
   PORT=no
 fi
 
-if test @host_os@ == mingw32; then
+if test x@host_os@ = xmingw32; then
   if test -z $with_qt_incdir; then
     with_qt_incdir=$prefix/include
   fi