Update to 2.2.28

Changes:	https://github.com/Unidata/UDUNITS-2/blob/master/CHANGE_LOG

science/udunits/Makefile

@@ -2,8 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	udunits
-PORTVERSION=	2.2.26
-PORTREVISION=	2
+PORTVERSION=	2.2.28
 CATEGORIES=	science math
 MASTER_SITES=	ftp://ftp.unidata.ucar.edu/pub/udunits/ \
 		LOCAL/sunpoet
@@ -18,17 +17,19 @@ LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
 
 LIB_DEPENDS=	libexpat.so:textproc/expat2
 
-OPTIONS_DEFINE=	DOCS
+USES=		libtool localbase
 
+CFLAGS+=	-D__BSD_VISIBLE
 CONFIGURE_ENV=	ac_cv_header_CUnit_CUnit_h=no
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 TEST_TARGET=	check
 USE_LDCONFIG=	yes
-USES=		libtool localbase
 
 INFO=		udunits2 udunits2lib udunits2prog
 
+OPTIONS_DEFINE=	DOCS
+
 post-patch:
 	@${REINPLACE_CMD} -e '/install-data-hook$$/d' ${WRKSRC}/lib/Makefile.in
 

science/udunits/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1514030046
-SHA256 (udunits-2.2.26.tar.gz) = 368f4869c9c7d50d2920fa8c58654124e9ed0d8d2a8c714a9d7fdadc08c7356d
-SIZE (udunits-2.2.26.tar.gz) = 1227596
+TIMESTAMP = 1609598847
+SHA256 (udunits-2.2.28.tar.gz) = 590baec83161a3fd62c00efa66f6113cec8a7c461e3f61a5182167e0cc5d579e
+SIZE (udunits-2.2.28.tar.gz) = 1224503

science/udunits/files/patch-lib-xml.c

@@ -0,0 +1,20 @@
+--- lib/xml.c.orig	2020-12-07 18:37:03 UTC
++++ lib/xml.c
+@@ -38,7 +38,7 @@
+ #endif
+ #include <sys/stat.h>
+ #include <sys/types.h>
+-#if defined(__linux__)
++#if defined(__linux__) || defined(__FreeBSD__)
+ #include <dlfcn.h>
+ #elif defined(__APPLE__)
+ #define _DARWIN_C_SOURCE
+@@ -2137,7 +2137,7 @@ default_udunits2_xml_path()
+     if (absXmlPathname[0] == 0) {
+         const char* prefix = NULL; // Installation directory
+ 
+-#       if defined(__APPLE__) || defined(__linux__)
++#       if defined(__APPLE__) || defined(__linux__) || defined(__FreeBSD__)
+             Dl_info     info;
+             const char  sep = '/'; // Pathname component separator
+             char        buf[PATH_MAX];