diff -ur libffi-3.2.1/include/Makefile.am libffi-3.2.1+Sane/include/Makefile.am
--- libffi-3.2.1/include/Makefile.am	2014-11-08 02:47:24.000000000 -1000
+++ libffi-3.2.1+Sane/include/Makefile.am	2018-08-14 10:09:46.000000000 -1000
@@ -5,5 +5,4 @@
 DISTCLEANFILES=ffitarget.h
 EXTRA_DIST=ffi.h.in ffi_common.h
 
-includesdir = $(libdir)/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
-nodist_includes_HEADERS = ffi.h ffitarget.h
+nodist_include_HEADERS = ffi.h ffitarget.h
diff -ur libffi-3.2.1/libffi.pc.in libffi-3.2.1+Sane/libffi.pc.in
--- libffi-3.2.1/libffi.pc.in	2014-11-08 02:47:24.000000000 -1000
+++ libffi-3.2.1+Sane/libffi.pc.in	2018-08-14 10:10:11.000000000 -1000
@@ -2,7 +2,7 @@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 toolexeclibdir=@toolexeclibdir@
-includedir=${libdir}/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includedir=@includedir@
 
 Name: @PACKAGE_NAME@
 Description: Library supporting Foreign Function Interfaces