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AC_DEFUN([PDNS_WITH_NGHTTP2], [
AC_MSG_CHECKING([whether we will be linking in nghttp2])
HAVE_NGHTTP2=0
AC_ARG_WITH([nghttp2],
AS_HELP_STRING([--with-nghttp2],[use nghttp2 @<:@default=auto@:>@]),
[with_nghttp2=$withval],
[with_nghttp2=auto],
)
AC_MSG_RESULT([$with_nghttp2])
AS_IF([test "x$with_nghttp2" != "xno"], [
AS_IF([test "x$with_nghttp2" = "xyes" -o "x$with_nghttp2" = "xauto"], [
PKG_CHECK_MODULES([NGHTTP2], [libnghttp2], [
[HAVE_NGHTTP2=1]
AC_DEFINE([HAVE_NGHTTP2], [1], [Define to 1 if you have nghttp2])
save_CFLAGS=$CFLAGS
save_LIBS=$LIBS
CFLAGS="$NGHTTP2_CFLAGS $CFLAGS"
LIBS="$NGHTTP2_LIBS $LIBS"
CFLAGS=$save_CFLAGS
LIBS=$save_LIBS
], [ : ])
])
])
AM_CONDITIONAL([HAVE_NGHTTP2], [test "x$NGHTTP2_LIBS" != "x"])
AS_IF([test "x$with_nghttp2" = "xyes"], [
AS_IF([test x"$NGHTTP2_LIBS" = "x"], [
AC_MSG_ERROR([nghttp2 requested but libraries were not found])
])
])
])
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