diff --git a/mach/6500/cg/Makefile b/mach/6500/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/6500/cg/Makefile
+++ b/mach/6500/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi
 
diff --git a/mach/pdp/cg/Makefile b/mach/pdp/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/pdp/cg/Makefile
+++ b/mach/pdp/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi
 
diff --git a/mach/proto/cg/Makefile b/mach/proto/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/proto/cg/Makefile
+++ b/mach/proto/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi
 
diff --git a/mach/vax4/cg/Makefile b/mach/vax4/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/vax4/cg/Makefile
+++ b/mach/vax4/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi
 
diff --git a/mach/z80/cg/Makefile b/mach/z80/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/z80/cg/Makefile
+++ b/mach/z80/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi
 
diff --git a/mach/z8000/cg/Makefile b/mach/z8000/cg/Makefile
index 93f97b75..54646908 100644
--- a/mach/z8000/cg/Makefile
+++ b/mach/z8000/cg/Makefile
@@ -71,7 +71,7 @@ distr:
 
 tables.c: table
 	-mv tables.h tables.h.save
-	/lib/cpp -P table | ../../../lib/cgg > debug.out
+	../../../lib/cpp -P table | ../../../lib/cgg > debug.out
 	-if cmp -s tables.h.save tables.h; then mv tables.h.save tables.h; else exit 0; fi
 	-if cmp -s /dev/null tables.h; then mv tables.h.save tables.h; else exit 0; fi