diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index e748a680d6..f8e38b9d09 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,3 +1,11 @@
+2003-02-18	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
+
+	* aclocal/gcc-isystem.m4: New.
+	* aclocal/gcc-specs.m4: Remove.
+	* aclocal/prog-cc.m4: Remove RTEMS_GCC_SPECS.
+	Add RTEMS_GCC_ISYSTEM.
+	Reformat setting up RTEMS_CPPFLAGS.
+
 2003-02-18	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
 
 	* automake/local.am: Introduce depend-gcc.
diff --git a/cpukit/aclocal/gcc-isystem.m4 b/cpukit/aclocal/gcc-isystem.m4
new file mode 100644
index 0000000000..c230508208
--- /dev/null
+++ b/cpukit/aclocal/gcc-isystem.m4
@@ -0,0 +1,25 @@
+dnl
+dnl $Id$
+dnl
+dnl Check whether the gcc accepts -isystem
+dnl
+
+AC_DEFUN(RTEMS_GCC_ISYSTEM,
+[AC_REQUIRE([RTEMS_PROG_CC])
+AC_CACHE_CHECK(whether $CC accepts -isystem,rtems_cv_gcc_isystem,
+[
+rtems_cv_gcc_isystem=no
+if test x"$GCC" = x"yes"; then
+cat << EOF > conftest.h
+int conftest123();
+EOF
+cat << EOF > conftest.c
+#include <conftest.h>
+int conftest123() {}
+EOF
+  if test -z "`${CC} -isystem./ -c conftest.c 2>&1`";then
+    rtems_cv_gcc_isystem=yes
+  fi
+fi
+rm -f conftest*
+])])
diff --git a/cpukit/aclocal/gcc-specs.m4 b/cpukit/aclocal/gcc-specs.m4
deleted file mode 100644
index ca0271424f..0000000000
--- a/cpukit/aclocal/gcc-specs.m4
+++ /dev/null
@@ -1,20 +0,0 @@
-dnl
-dnl $Id$
-dnl
-dnl Check whether the target compiler accepts -specs
-dnl
-
-AC_DEFUN(RTEMS_GCC_SPECS,
-[AC_REQUIRE([RTEMS_PROG_CC])
-AC_CACHE_CHECK(whether $CC accepts -specs,rtems_cv_gcc_specs,
-[
-rtems_cv_gcc_specs=no
-if test x"$GCC" = x"yes"; then
-  touch confspec
-  echo 'void f(){}' >conftest.c
-  if test -z "`${CC} -specs confspec -c conftest.c 2>&1`";then
-    rtems_cv_gcc_specs=yes
-  fi
-fi
-rm -f confspec conftest*
-])])
diff --git a/cpukit/aclocal/prog-cc.m4 b/cpukit/aclocal/prog-cc.m4
index 92bd7749ce..117229bbe4 100644
--- a/cpukit/aclocal/prog-cc.m4
+++ b/cpukit/aclocal/prog-cc.m4
@@ -26,8 +26,8 @@ AC_DEFUN(RTEMS_PROG_CC_FOR_TARGET,
 [
 dnl check target cc
 RTEMS_PROG_CC
-dnl check if the compiler supports --specs
-RTEMS_GCC_SPECS
+dnl check if the compiler supports -isystem
+RTEMS_GCC_ISYSTEM
 dnl check if the target compiler may use --pipe
 RTEMS_GCC_PIPE
 test "$rtems_cv_gcc_pipe" = "yes" && CC="$CC --pipe"
@@ -35,9 +35,12 @@ test "$rtems_cv_gcc_pipe" = "yes" && CC="$CC --pipe"
 if test "$GCC" = yes; then
 RTEMS_CFLAGS="$RTEMS_CFLAGS -Wall"
 m4_if([$1],,[],[RTEMS_CFLAGS="$RTEMS_CFLAGS $1"])
-RTEMS_CPPFLAGS="-isystem \$(PROJECT_INCLUDE)"
-else
-RTEMS_CPPFLAGS="-I\$(PROJECT_INCLUDE)"
 fi
-AC_SUBST(RTEMS_CPPFLAGS)
+
+AS_IF([test x"$rtems_cv_gcc_isystem" = x"yes"],[
+  RTEMS_CPPFLAGS="-isystem \$(PROJECT_INCLUDE)"],[
+  RTEMS_CPPFLAGS="-I\$(PROJECT_INCLUDE)"
+])
+AC_SUBST(RTEMS_CPPFLAGS)
+
 ])