Stripped down the library to something approaching the ANSI C minimum and replaced most of the header files, to provide a reasonably consistent base to work up from.

lang/cem/libcc.ansi/headers/tgmath.h

@@ -0,0 +1,11 @@
+/*
+    <tgmath.h> -- simple version used by "gimplify"
+
+    last edit:  2007-02-12  D A Gwyn
+*/
+
+/* XXX -- Can't be done right without compiler support; it *may* suffice to
+   use automatic coercion to type double with the <math.h> prototypes. */
+
+#include    <math.h>
+#include    <complex.h>