Unbreak this port

PR:		221334
Reported by:	pi
MFH:		2017Q3

graphics/gmt/Makefile

@@ -25,8 +25,6 @@ LICENSE_COMB=	multi
 LICENSE_DISTFILES_GPLv2=	${DISTNAME}${EXTRACT_SUFX}
 LICENSE_DISTFILES_LGPL3=	${GSHHG_DISTNAME}${EXTRACT_SUFX}
 
-BROKEN=		fails to build
-
 LIB_DEPENDS=	libnetcdf.so:science/netcdf
 RUN_DEPENDS=	bash:shells/bash
 

graphics/gmt/files/patch-src-gmt_io.c

@@ -0,0 +1,14 @@
+--- src/gmt_io.c.orig	2016-03-07 01:35:42 UTC
++++ src/gmt_io.c
+@@ -80,11 +80,7 @@
+  */
+ 
+ /* Circumvent Solaris problem. See bug #817 */
+-#ifdef __FreeBSD__
+-#define _XOPEN_SOURCE
+-#else
+ #define _XOPEN_SOURCE 600
+-#endif
+ 
+ #define GMT_WITH_NO_PS
+ #include "gmt.h"

graphics/gmt/files/patch-src-gmtmath.c

@@ -0,0 +1,14 @@
+--- src/gmtmath.c.orig	2016-03-07 01:35:42 UTC
++++ src/gmtmath.c
+@@ -61,11 +61,7 @@
+  */
+ 
+ /* Circumvent Solaris problem. See bug #817 */
+-#ifdef __FreeBSD__
+-#define _XOPEN_SOURCE
+-#else
+ #define _XOPEN_SOURCE 600
+-#endif
+ 
+ #include "gmt.h"
+ 

graphics/gmt/files/patch-src-grdmath.c

@@ -0,0 +1,14 @@
+--- src/grdmath.c.orig	2016-03-07 01:35:42 UTC
++++ src/grdmath.c
+@@ -51,11 +51,7 @@
+  */
+ 
+ /* Circumvent Solaris problem. See bug #817 */
+-#ifdef __FreeBSD__
+-#define _XOPEN_SOURCE
+-#else
+ #define _XOPEN_SOURCE 600
+-#endif
+ 
+ #include "gmt.h"
+ 

graphics/gmt/files/patch-src-misc-gmtdigitize.c

@@ -0,0 +1,14 @@
+--- src/misc/gmtdigitize.c.orig	2016-03-07 01:35:42 UTC
++++ src/misc/gmtdigitize.c
+@@ -38,11 +38,7 @@
+  */
+ 
+ /* Circumvent Solaris problem. See bug #817 */
+-#ifdef __FreeBSD__
+-#define _XOPEN_SOURCE
+-#else
+ #define _XOPEN_SOURCE 600
+-#endif
+  
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>