diff --git a/ac/ax_boost_filesystem.m4 b/ac/ax_boost_filesystem.m4
index 97c4ad0..87b94a8 100644
--- a/ac/ax_boost_filesystem.m4
+++ b/ac/ax_boost_filesystem.m4
@@ -81,14 +81,14 @@ AC_DEFUN([AX_BOOST_FILESYSTEM],
 			AC_DEFINE(HAVE_BOOST_FILESYSTEM,,[define if the Boost::Filesystem library is available])
             BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
             if test "x$ax_boost_user_filesystem_lib" = "x"; then
-                for libextension in `ls $BOOSTLIBDIR/libboost_filesystem*.{so,dylib,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's,^lib\(boost_filesystem.*\)\.so.*$,\1,' -e 's,^lib\(boost_filesystem.*\)\.dylib.*$,\1,' -e 's,^lib\(boost_filesystem.*\)\.a.*$,\1,'`; do
+                for libextension in `ls $BOOSTLIBDIR/libboost_filesystem*.so* $BOOSTLIBDIR/libboost_filesystem*.dylib* $BOOSTLIBDIR/libboost_filesystem*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_filesystem.*\)\.\(dylib\|a\|so\).*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_FILESYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_FILESYSTEM_LIB) link_filesystem="yes"; break],
                                  [link_filesystem="no"],[$BOOST_SYSTEM_LIB])
 				done
                 if test "x$link_filesystem" != "xyes"; then
-                for libextension in `ls $BOOSTLIBDIR/boost_filesystem*.{dll,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_filesystem.*\)\.dll.*$;\1;' -e 's;^\(boost_filesystem.*\)\.a*$;\1;'` ; do
+                for libextension in `ls $BOOSTLIBDIR/boost_filesystem*.dll* $BOOSTLIBDIR/boost_filesystem*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_filesystem.*\)\.\(dll\|a\).*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_FILESYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_FILESYSTEM_LIB) link_filesystem="yes"; break],
diff --git a/ac/ax_boost_regex.m4 b/ac/ax_boost_regex.m4
index ffd537f..2cef64f 100644
--- a/ac/ax_boost_regex.m4
+++ b/ac/ax_boost_regex.m4
@@ -75,14 +75,14 @@ AC_DEFUN([AX_BOOST_REGEX],
 			AC_DEFINE(HAVE_BOOST_REGEX,,[define if the Boost::Regex library is available])
             BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
             if test "x$ax_boost_user_regex_lib" = "x"; then
-                for libextension in `ls $BOOSTLIBDIR/libboost_regex*.{so,dylib,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's,^lib\(boost_regex.*\)\.so.*$,\1,' -e 's,^lib\(boost_regex.*\)\.dylib.*$,\1,' -e 's,^lib\(boost_regex.*\)\.a.*$,\1,'`; do
+                for libextension in `ls $BOOSTLIBDIR/libboost_regex*.so* $BOOSTLIBDIR/libboost_regex*.dylib* $BOOSTLIBDIR/libboost_regex*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_regex.*\)\.so.*$;\1;' -e 's;^lib\(boost_regex.*\)\.dylib.*;\1;' -e 's;^lib\(boost_regex.*\)\.a.*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_REGEX_LIB="-l$ax_lib"; AC_SUBST(BOOST_REGEX_LIB) link_regex="yes"; break],
                                  [link_regex="no"])
 				done
                 if test "x$link_regex" != "xyes"; then
-                for libextension in `ls $BOOSTLIBDIR/boost_regex*.{dll,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_regex.*\)\.dll.*$;\1;' -e 's;^\(boost_regex.*\)\.a*$;\1;'` ; do
+                for libextension in `ls $BOOSTLIBDIR/boost_regex*.dll* $BOOSTLIBDIR/boost_regex*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_regex.*\)\.dll.*$;\1;' -e 's;^\(boost_regex.*\)\.a.*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_REGEX_LIB="-l$ax_lib"; AC_SUBST(BOOST_REGEX_LIB) link_regex="yes"; break],
diff --git a/ac/ax_boost_system.m4 b/ac/ax_boost_system.m4
index b0685b9..a71907b 100644
--- a/ac/ax_boost_system.m4
+++ b/ac/ax_boost_system.m4
@@ -83,14 +83,14 @@ AC_DEFUN([AX_BOOST_SYSTEM],
 
 			LDFLAGS_SAVE=$LDFLAGS
             if test "x$ax_boost_user_system_lib" = "x"; then
-                for libextension in `ls $BOOSTLIBDIR/libboost_system*.{so,dylib,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's,^lib\(boost_system.*\)\.so.*$,\1,' -e 's,^lib\(boost_system.*\)\.dylib.*$,\1,' -e 's,^lib\(boost_system.*\)\.a.*$,\1,'`; do
+                for libextension in `ls $BOOSTLIBDIR/libboost_system*.a* $BOOSTLIBDIR/libboost_system*.so* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_system.*\)\.\(so\|a\).*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
                                  [link_system="no"])
 				done
                 if test "x$link_system" != "xyes"; then
-                for libextension in `ls $BOOSTLIBDIR/boost_system*.{dll,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_system.*\)\.dll.*$;\1;' -e 's;^\(boost_system.*\)\.a*$;\1;'` ; do
+                for libextension in `ls $BOOSTLIBDIR/boost_system*.{dll,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_system.*\)\.\(dll\|a\).*$;\1;'` ; do
                      ax_lib=${libextension}
 				    AC_CHECK_LIB($ax_lib, exit,
                                  [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],