--- /dev/null
+From 8b80c4bd848ff3d71b998dc8a4bd42627ed72581 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 17 Apr 2021 11:58:19 +0200
+Subject: [PATCH] configure.ac: fix cross-compilation with protobuf-c
+
+Try to retrieve the version from pkg-config to avoid the following
+error:
+
+checking protobuf-c version... configure: error: in `/home/fabrice/buildroot/output/build/postgis-3.1.1':
+configure: error: cannot run test program while cross compiling
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://github.com/postgis/postgis/commit/8b80c4bd848ff3d71b998dc8a4bd42627ed72581]
+---
+ configure.ac | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 48ba070a40..df75fe6601 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1004,6 +1004,7 @@ if test "$CHECK_PROTOBUF" != "no"; then
+ PKG_CHECK_MODULES([PROTOBUFC], [libprotobuf-c >= 1.1.0], [
+ PROTOBUF_CPPFLAGS="$PROTOBUFC_CFLAGS";
+ PROTOBUF_LDFLAGS="$PROTOBUFC_LIBS";
++ PROTOC_VERSION=`$PKG_CONFIG libprotobuf-c --modversion | sed 's/\([[0-9]]\).*\([[0-9]]\).*\([[0-9]]\)/\100\200\3/'`
+ ], [
+ AC_MSG_RESULT([libprotobuf-c not found in pkg-config])
+ ])
+@@ -1054,7 +1055,10 @@ if test "$CHECK_PROTOBUF" != "no"; then
+ [])
+
+ AC_MSG_CHECKING([protobuf-c version])
+- AC_PROTOBUFC_VERSION([PROTOC_VERSION])
++ dnl Return the protobuf-c version number if not detected by pkg-config
++ if test "x$PROTOC_VERSION" = "x"; then
++ AC_PROTOBUFC_VERSION([PROTOC_VERSION])
++ fi
+ if test ! "$PROTOC_VERSION" -ge 1001000; then
+ AC_MSG_ERROR("Old protobuf-c release found but 1.1.0 is required. You can disable MVT and Geobuf support using --without-protobuf")
+ fi
POSTGIS_CONF_OPTS += \
--with-pgconfig=$(STAGING_DIR)/usr/bin/pg_config \
--with-geosconfig=$(STAGING_DIR)/usr/bin/geos-config \
- --with-xml2config=$(STAGING_DIR)/usr/bin/xml2-config \
- --without-protobuf
+ --with-xml2config=$(STAGING_DIR)/usr/bin/xml2-config
ifeq ($(BR2_PACKAGE_LIBGDAL),y)
POSTGIS_DEPENDENCIES += libgdal
POSTGIS_DEPENDENCIES += pcre
endif
+ifeq ($(BR2_PACKAGE_PROTOBUF_C),y)
+POSTGIS_DEPENDENCIES += protobuf-c
+POSTGIS_CONF_OPTS += --with-protobuf
+else
+POSTGIS_CONF_OPTS += --without-protobuf
+endif
+
$(eval $(autotools-package))