diff --git a/tests/libc/runtime.c b/tests/libc/runtime.c
index 25588a82e04f0833265e745ac70217161f1b0ef7..a99e23548c9e6ac3b88d10d4cc9d93dc25865cf9 100644
--- a/tests/libc/runtime.c
+++ b/tests/libc/runtime.c
@@ -1,5 +1,6 @@
 /* run.config*
    COMMENT: tests that the runtime can compile without errors (for PathCrawler, E-ACSL, ...)
+   ENABLED_IF: %{bin-available:gcc}
    CMD: FRAMAC='@frama-c@' %{dep:@PTEST_DIR@/runtime.sh}
    OPT: %{dep:@FRAMAC_SHARE@/libc/__fc_runtime.c}
  */
diff --git a/tests/libc/runtime.sh b/tests/libc/runtime.sh
index aee0cf3d823f1aa61f34db70db8fd8caae2f4239..87893cee2481a134b0f831e3fb8830b974556ebc 100755
--- a/tests/libc/runtime.sh
+++ b/tests/libc/runtime.sh
@@ -3,5 +3,5 @@ set -e
 if test -z "$FRAMAC"; then echo "variable FRAMAC must be set"; exit 1; fi
 TMPDIR=$(mktemp -d fc_test_libc_XXXXXXXX)
 $FRAMAC -print-machdep-header > $TMPDIR/__fc_machdep.h
-gcc -I$TMPDIR -D__FC_MACHDEP_X86_64 $@ -Wno-attributes -std=c99 -Wall -Wwrite-strings -o /dev/null
+gcc -I$TMPDIR -D__FC_MACHDEP_X86_64 $@ -Wno-attributes -std=c99 -Wall -Wwrite-strings -Wno-builtin-macro-redefined -Wno-unknown-warning-option -o /dev/null
 rm -fr $TMPDIR