diff --git a/docs/cookbook/c/all.rc.od b/docs/cookbook/c/all.rc.od
index 179fc92..5b050d2 100644
--- a/docs/cookbook/c/all.rc.od
+++ b/docs/cookbook/c/all.rc.od
@@ -9,7 +9,7 @@ rc_include \
 	rc/libm.rc \
 	rc/rt.autolib.rc \
 	rc/libpng.rc \
-	rc/clock_gettime.func.rc \
+	rc/clock_gettime.rc \
 	rc/mach_time.h.rc \
 	rc/windows.h.rc \
 	rc/posix.rc \
diff --git a/docs/cookbook/c/rc/clock_gettime.rc.od b/docs/cookbook/c/rc/clock_gettime.rc.od
new file mode 100644
index 0000000..85a3307
--- /dev/null
+++ b/docs/cookbook/c/rc/clock_gettime.rc.od
@@ -0,0 +1,17 @@
+. ./redoconf.rc
+rc_include rc/CC.rc rc/rt.autolib.rc rc/posix.rc
+
+prog="
+#include <time.h>
+
+void test() { clock_gettime(CLOCK_MONOTONIC, NULL); }
+"
+
+rc_appendln LIBS "$LIBRT"
+if rc_compile cc link "$prog"; then
+	rc_replaceln "HAVE_CLOCK_GETTIME" 1
+else
+	rc_undo
+	rc_replaceln "HAVE_CLOCK_GETTIME" ""
+fi
+rc_save
diff --git a/redoconf/rc/default.func.rc.od b/redoconf/rc/default.func.rc.od
deleted file mode 100644
index 2fcf87a..0000000
--- a/redoconf/rc/default.func.rc.od
+++ /dev/null
@@ -1,13 +0,0 @@
-. ./redoconf.rc
-rc_include rc/CC.rc
-
-base="${1#*/}"
-f="${base%.func.rc}"
-F=$(echo "$f" | tr 'a-z.' 'A-Z_')
-
-if rc_compile cc link "void $f(); void test() { $f(); }"; then
-	rc_replaceln "HAVE_$F" 1
-else
-	rc_replaceln "HAVE_$F" ""
-fi
-rc_save