Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -7,11 +7,11 @@
 CC = @CC@
 CPP = @CPP@
 AR = @AR@
 RANLIB = @RANLIB@
 CFLAGS = @CFLAGS@ @SHOBJFLAGS@
-CPPFLAGS = @CPPFLAGS@ -I@srcdir@ -I@srcdir@/tcc -Itcc @DEFS@ @SHOBJCPPFLAGS@
+CPPFLAGS = @CPPFLAGS@ -I$(shell cd @srcdir@ && pwd) -I$(shell cd @srcdir@ && pwd)/tcc -I$(shell pwd)/tcc @DEFS@ @SHOBJCPPFLAGS@
 LDFLAGS = @LDFLAGS@
 SHOBJLDFLAGS = @SHOBJLDFLAGS@
 LIBS = @LIBS@
 INSTALL = @INSTALL@
 TCLSH = tclsh