diff --git a/lang/m2/m2mm/lib.c b/lang/m2/m2mm/lib.c
index 6511220a..79835f6d 100644
--- a/lang/m2/m2mm/lib.c
+++ b/lang/m2/m2mm/lib.c
@@ -41,6 +41,10 @@ is_library_dir(d)
 	return 0;
 }
 
+#ifndef DEF_DIR
+#define DEF_DIR	"lib/m2"
+#endif
+
 init_lib()
 {
 	extern char *strcat();
diff --git a/lang/m2/m2mm/main.c b/lang/m2/m2mm/main.c
index e14f38d0..95a84336 100644
--- a/lang/m2/m2mm/main.c
+++ b/lang/m2/m2mm/main.c
@@ -73,6 +73,10 @@ getwdir(fn)
 
 static struct file_list *arglist;
 
+#ifndef M2COMPILER
+#define M2COMPILER	"m2"
+#endif
+
 char *mflags = "";
 char *compiler = M2COMPILER;
 char *suff = "o";