[Bug 216426] graphics/gdal: Build failure on upgrade to gdal-2.1.2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216426

            Bug ID: 216426
           Summary: graphics/gdal: Build failure on upgrade to gdal-2.1.2
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: freebsd at dirichs.fastmail.fm
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)

While updating the ports tree from FreeBSD 10.2 to 10.3, a new build of
gdal-2.1.2 failed with the following error message:

c++ -L/usr/local/lib -fstack-protector gdalinfo_bin.o 
-L/usr/ports/graphics/gdal/work/gdal-2.1.2 -lgdal  -ljson-c -L/usr/local/lib
-lgeos_c -ljasper -ljpeg -lgeotiff -ltiff -lpng -L/usr/local/lib -lpq -llzma
-lz -L/usr -L/usr/lib -lpthread -lm -lrt -L/usr/local/lib               
-L/usr/local/lib -lxml2 -lz -llzma -L/usr/lib -lm     -o gdalinfo
/usr/bin/ld: warning: libgif.so.6, needed by /usr/local/lib/libgdal.so, not
found (try using -rpath or -rpath-link)

The problem is caused by an upgrade of graphics/giflib which happened alonside
with the gdal update. The old /usr/local/lib/libgdal.so that was already
installed on my system linked to libgif.so.6, which was no longer around after
the upgrade. The above command fails because the specified library search path
"-L/usr/local/lib" finds the old libgdal first - which does not work any more.
Running the command without it as the first parameter:

cd /usr/ports/graphics/gdal/work/gdal-2.1.2/apps &&
c++ -fstack-protector gdalinfo_bin.o 
-L/usr/ports/graphics/gdal/work/gdal-2.1.2 -lgdal  -ljson-c -L/usr/local/lib
-lgeos_c -ljasper -ljpeg -lgeotiff -ltiff -lpng -L/usr/local/lib -lpq -llzma
-lz -L/usr -L/usr/lib -lpthread -lm -lrt -L/usr/local/lib               
-L/usr/local/lib -lxml2 -lz -llzma -L/usr/lib -lm     -o gdalinfo

succeeds without any error. "-L/usr/local/lib" is specified many times more,
this seems redundant to me. Anyway, only the first specification of
"-L/usr/local/lib" causes an error since it is before
"-L/usr/ports/graphics/gdal/work/gdal-2.1.2" which should be the first place to
look for gdal binaries.

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