math/capc-calc wants /usr/include but osx 10.11 moved it out of /usr

[Chuck Cranor <chuck%ece.cmu.edu@localhost>]

hi-

    By default, the Makefile for capc-calc determines if files like 
<unistd.h> are present at run time by doing a "test -f" in /usr/include.
It writes the result as as #define in a dynamically generated .h file.
(e.g. HAVE_UNISTD is #define'd in dynamically generated have_unistd.h)

    you can define an alternate include directory to look in with
$INCDIR in the Makefile.  patch-aa does this, setting it to ${PREFIX}/include :

$NetBSD: patch-aa,v 1.9 2014/01/15 16:23:31 drochner Exp $

--- Makefile.orig       2013-09-01 23:02:02.000000000 +0000
+++ Makefile
@@ -585,7 +585,7 @@ HAVE_UNUSED=
 
 #INCDIR= /usr/local/include
 #INCDIR= /dev/env/DJDIR/include
-INCDIR= /usr/include
+INCDIR= ${PREFIX}/include



    in Darwin 10.11, Apple moved /usr/include out of /usr for their
rootless security feature.   Instead it appears to live in a directory
like:

    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include

older versions of Darwin still have /usr/include.


   this prevents pkgsrc from compiling capc-calc.   


   what's the best way to address this?   should I try and get the 
/Applications/... include file in the Makefile, or should I just 
hardware HAVE_UNISTD on somehow?   

chuck



chuck