diff -u -r ../gnuplot-4.6.5/docs/Makefile.in ./docs/Makefile.in
--- ../gnuplot-4.6.5/docs/Makefile.in	2013-09-24 01:16:41.000000000 +0200
+++ ./docs/Makefile.in	2014-07-15 19:43:12.670797472 +0200
@@ -73,14 +73,14 @@
 INFO_DEPS = $(srcdir)/gnuplot.info
 
 CC     = @CC_FOR_BUILD@
-CPP    = @CPP@
+CPP    = cpp
 DEFS   = @DEFS@
 DEFAULT_INCLUDES = -I. -I$(srcdir) -I.. -I$(top_builddir)
-CPPFLAGS = @CPPFLAGS@
-CFLAGS = @CFLAGS@
+CPPFLAGS = 
+CFLAGS = 
 GIHDIR = @GIHDIR@
 INCLUDES = -I$(top_srcdir)/src -I$(top_srcdir)/term
-LDFLAGS = @LDFLAGS@
+LDFLAGS = 
 LIBS = @LIBS@
 
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)