Index: ../trunk-jpl/m4/issm_options.m4
===================================================================
--- ../trunk-jpl/m4/issm_options.m4	(revision 24349)
+++ ../trunk-jpl/m4/issm_options.m4	(revision 24350)
@@ -1489,7 +1489,7 @@
 	AC_MSG_RESULT($HAVE_BLASLAPACK)
 
 	dnl blas-lapack headers and libraries
-	if test "x$HAVE_BLASLAPACK" == "xyes"; then
+	if test "x$HAVE_BLASLAPACK" = "xyes"; then
 		BLASLAPACKINCL=""
 		case "${host_os}" in
 		*cygwin*)
@@ -1497,7 +1497,7 @@
 		  ;;
 		*linux*)
 			BLASLAPACKLIB="-L${BLASLAPACK_ROOT}/lib"
-			if "x${BLASLAPACK_ROOT}" == "x${PETSC_ROOT}"; then
+			if test "x${BLASLAPACK_ROOT}" = "x${PETSC_ROOT}"; then
 				BLASLAPACKLIB+=" -lflapack -lfblas"
 			else
 				BLASLAPACKLIB+=" -llapack -lblas"
@@ -1505,7 +1505,7 @@
 		;;
 		*darwin*)
 			BLASLAPACKLIB="-L${BLASLAPACK_ROOT}/lib"
-			if "x${BLASLAPACK_ROOT}" == "x${PETSC_ROOT}"; then
+			if test "x${BLASLAPACK_ROOT}" = "x${PETSC_ROOT}"; then
 				BLASLAPACKLIB+=" -lflapack -lfblas"
 			else
 				BLASLAPACKLIB+=" -llapack -lblas"