diff --git a/libs/libg722_1/configure.ac b/libs/libg722_1/configure.ac
index 62095ce374..829d7e0c45 100644
--- a/libs/libg722_1/configure.ac
+++ b/libs/libg722_1/configure.ac
@@ -200,7 +200,7 @@ AC_CHECK_HEADERS([audiofile.h])
 
 AC_LANG([C])
 
-if test "${build}" == "${host}"
+if test "${build}" = "${host}"
 then
     case "${host}" in
     x86_64-*)
diff --git a/libs/sofia-sip/scripts/lcov-report b/libs/sofia-sip/scripts/lcov-report
index 364f798128..77a0aaf40f 100755
--- a/libs/sofia-sip/scripts/lcov-report
+++ b/libs/sofia-sip/scripts/lcov-report
@@ -11,7 +11,7 @@
 
 usage()
 {
-  test X$1 == X0 || exec >&2
+  test X$1 = X0 || exec >&2
   cat << EOF
 usage: coverage-report OPTIONS
 where OPTIONS are
diff --git a/libs/sofia-sip/scripts/uncovered b/libs/sofia-sip/scripts/uncovered
index 80f14ffad4..bdd156c789 100755
--- a/libs/sofia-sip/scripts/uncovered
+++ b/libs/sofia-sip/scripts/uncovered
@@ -11,7 +11,7 @@
 
 usage()
 {
-  test X$1 == X0 || exec >&2
+  test X$1 = X0 || exec >&2
   cat <<EOF
 usage: uncovered OPTIONS
 where OPTIONS are
diff --git a/libs/spandsp/configure.ac b/libs/spandsp/configure.ac
index 9928098765..2464bd70c8 100644
--- a/libs/spandsp/configure.ac
+++ b/libs/spandsp/configure.ac
@@ -199,7 +199,7 @@ AC_CHECK_HEADERS([fenv.h])
 AC_CHECK_HEADERS([fftw3.h], , [AC_CHECK_HEADERS([fftw.h])])
 AC_CHECK_HEADERS([pcap.h])
 AC_CHECK_HEADERS([pthread.h])
-if test "${build}" == "${host}"
+if test "${build}" = "${host}"
 then
     AC_CHECK_HEADERS([X11/X.h])
 fi
@@ -243,7 +243,7 @@ AC_CHECK_HEADERS([FL/Fl_Audio_Meter.H])
 
 AC_LANG([C])
 
-if test "${build}" == "${host}"
+if test "${build}" = "${host}"
 then
     case "${host}" in
     x86_64-*)
diff --git a/libs/spandsp/unpack_gsm0610_data.sh b/libs/spandsp/unpack_gsm0610_data.sh
index d1f8b92a23..482334c79e 100755
--- a/libs/spandsp/unpack_gsm0610_data.sh
+++ b/libs/spandsp/unpack_gsm0610_data.sh
@@ -53,7 +53,7 @@ else
     cd gsm0610
 fi
 
-if [ $1x ==  --no-exe-runx ]
+if [ $1x =  --no-exe-runx ]
 then
     # Run the .exe files, which should be here
     ./FR_A.EXE
@@ -77,7 +77,7 @@ rm -rf READ_FRA.TXT
 rm -rf ACTION
 rm -rf unpacked
 
-if [ $1x ==  --no-exex ]
+if [ $1x =  --no-exex ]
 then
     # We need to prepare the .exe files to be run separately
     rm -rf *.INP
diff --git a/libs/tiff-4.0.2/configure.ac b/libs/tiff-4.0.2/configure.ac
index ba3601edc7..164b08a059 100644
--- a/libs/tiff-4.0.2/configure.ac
+++ b/libs/tiff-4.0.2/configure.ac
@@ -777,7 +777,7 @@ AC_ARG_WITH(jpeg12-lib,
 	    AS_HELP_STRING([--with-jpeg12-lib=LIBRARY],
 			   [path to libjpeg 12bit library]),,)
 
-if test "x$enable_jpeg12" == "xyes" ; then
+if test "x$enable_jpeg12" = "xyes" ; then
 
   if test "x$with_jpeg12_lib" != "x" ; then
     LIBS="$with_jpeg12_lib $LIBS"