diff --git a/scripts/crosstool-NG.sh.in b/scripts/crosstool-NG.sh.in
index 68d68477..6313f320 100644
--- a/scripts/crosstool-NG.sh.in
+++ b/scripts/crosstool-NG.sh.in
@@ -60,6 +60,9 @@ CT_TestAndAbort "Don't set CPLUS_INCLUDE_PATH. It screws up the build." -n "${CP
 CT_TestAndAbort "Don't set OBJC_INCLUDE_PATH. It screws up the build." -n "${OBJC_INCLUDE_PATH}"
 CT_TestAndAbort "Don't set CFLAGS. It screws up the build." -n "${CFLAGS}"
 CT_TestAndAbort "Don't set CXXFLAGS. It screws up the build." -n "${CXXFLAGS}"
+CT_TestAndAbort "Don't set CC.  Support is planned, but currently it screws up the build. Ensure the GCC you
+want to use is the first 'gcc' instance in your \${PATH} environment variable." -n "${CC}"
+CT_TestAndAbort "Don't set CXX. It screws up the build." -n "${CXX}"
 CT_Test "GREP_OPTIONS screws up the build. Resetting." -n "${GREP_OPTIONS}"
 export GREP_OPTIONS=
 # Workaround against openSUSE 12.1 that breaks ./configure for cross-compilation: