configure has a bashism

[Even Rouault]

Reported as ​https://lists.osgeo.org/pipermail/gdal-dev/2017-January/045875.html

"""Not a big deal but it will cause configure to fail with a POSIX-conforming shell without bash extensions, and pkgsrc's portability check code throws an error."""

$NetBSD$

Remediate bashism.
Not yet reported upstream.

--- configure.orig      2016-10-24 11:00:31.000000000 +0000
+++ configure
@@ -16861,7 +16861,7 @@ ac_link='$CC -o conftest$ac_exeext $CFLA
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
-if test "x$CXX" == x ; then
+if test "x$CXX" = x ; then
   as_fn_error $? "\"You don't have a working C++ compiler.\"" "$LINENO" 5
 fi

[Even Rouault]

Fixed in trunk r37198

[Even Rouault]

In 37199:

configure: remove bashism (reported by Greg Troxel) (fixes #6791)