--- Lib/GIS/Proj/include/projects.h.orig	2015-06-18 09:20:50.000000000 -0700
+++ Lib/GIS/Proj/include/projects.h	2015-06-18 09:36:04.000000000 -0700
@@ -383,7 +383,7 @@
 double pj_authlat(double, double *);
 COMPLEX pj_zpoly1(COMPLEX, COMPLEX *, int);
 COMPLEX pj_zpolyd1(COMPLEX, COMPLEX *, int, COMPLEX *);
-FILE *pj_open_lib(projCtx, char *, char *);
+PAFile pj_open_lib(projCtx, const char *, const char *);
 
 int pj_deriv(LP, double, PJ *, struct DERIVS *);
 int pj_factors(LP, PJ *, double, struct FACTORS *);