--- gsm-1.0-pl13.old/Makefile
+++ gsm-1.0-pl13/Makefile
@@ -71,7 +71,7 @@
 # Leave INSTALL_ROOT empty (or just don't execute "make install") to
 # not install gsm and toast outside of this directory.
 
-INSTALL_ROOT	=
+INSTALL_ROOT	= __META_PKGDIR_PROD__
 
 # Where do you want to install the gsm library, header file, and manpages?
 #
@@ -80,7 +80,7 @@
 
 GSM_INSTALL_ROOT = $(INSTALL_ROOT)
 GSM_INSTALL_LIB = $(GSM_INSTALL_ROOT)/lib
-GSM_INSTALL_INC = $(GSM_INSTALL_ROOT)/inc
+GSM_INSTALL_INC = $(GSM_INSTALL_ROOT)/include
 GSM_INSTALL_MAN = $(GSM_INSTALL_ROOT)/man/man3