Index: arch/typesize.c
==================================================================
--- arch/typesize.c
+++ arch/typesize.c
@@ -1,13 +1,20 @@
 #include <stdio.h>
 #include <limits.h>
 #include <stddef.h>
 
-#define sflag(flag,val) printf("-D"#flag"=\"%s\" ", val)
-#define mflag(flag,val) printf("-D"#flag"=-%llu ", val + 1)
-#define iflag(flag,val) printf("-D"#flag"=%llu ", val)
-#define fflag(flag,val) printf("-D"#flag"=%Lf ", val)
+#ifndef _emit_m4_include
+#	define sflag(flag,val) printf("-D"#flag"=\"%s\" ", val)
+#	define mflag(flag,val) printf("-D"#flag"=-%llu ", val + 1)
+#	define iflag(flag,val) printf("-D"#flag"=%llu ", val)
+#	define fflag(flag,val) printf("-D"#flag"=%Lf ", val)
+#else
+#	define sflag(flag,val) printf("define(`"#flag"',`%s')dnl\n", val)
+#	define mflag(flag,val) printf("define(`"#flag"',`%llu')dnl\n", val + 1)
+#	define iflag(flag,val) printf("define(`"#flag"',`%llu')dnl\n", val)
+#	define fflag(flag,val) printf("define(`"#flag"',`%Lf')dnl\n", val)
+#endif
 #define type_found(val) (found_type & (val / 8))
 #define checkbits(type,x) \
 	if(!type_found(x) && sizeof(type) == (x/CHAR_BIT)) \
 		sflag(type_bit##x, #type), found_type |= (x / 8)
 

ADDED   makerule
Index: makerule
==================================================================
--- makerule
+++ makerule
@@ -0,0 +1,29 @@
+#- makerule
+# this file contains definitions shared between modmake and
+# the top-leve makefile
+# vim: ft=make
+
+ARCH ?= ${ARCH}
+BITS ?= ${BITS}
+OS ?= ${OS}
+
+POSIX ?= ${POSIX}
+UNIX ?= ${UNIX}
+
+ROOT ?= ${ROOT}
+TMP ?= ${TMP}
+OUT ?= ${OUT}
+
+m4 ?= ${m4}
+
+cflags = -std=c11 -isystem $(OUT) -isystem $(TMP) -isystem $(ROOT)/arch -fPIC -nostdlib $(COMPLIB) -L$(OUT)
+
+m-env = atom_target_arch=$(ARCH)
+m-env += atom_target_os=$(OS)
+ifneq ($(BITS),) #!!! ifdef does NOT work with environment variables
+    m-env += atom_target_bits=$(BITS)
+endif
+m-env += target_posix=$(POSIX)
+m-env += target_unix=$(UNIX)
+
+m-comp = $(m4) $(m-env:%=-D%)