SB: add pkg config path for openjpeg in gdal

SuperBuild/CMake/External_gdal.cmake

@@ -29,7 +29,9 @@ ADD_SUPERBUILD_CONFIGURE_VAR(GDAL TIFF_ROOT     --with-libtiff)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL GEOTIFF_ROOT  --with-geotiff)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL PNG_ROOT      --with-png)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL JPEG_ROOT     --with-jpeg)
-ADD_SUPERBUILD_CONFIGURE_VAR(GDAL OPENJPEG_ROOT --with-openjpeg)
+# This is not needed as from GDAL 2.4 it uses pkg-config to find openjpeg.
+# It is found thanks to the $PKG_CONFIG_PATH in SB_ENV_CONFIGURE_CMD
+# ADD_SUPERBUILD_CONFIGURE_VAR(GDAL OPENJPEG_ROOT --with-openjpeg)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL SQLITE_ROOT   --with-sqlite3)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL ZLIB_ROOT     --with-libz)
 ADD_SUPERBUILD_CONFIGURE_VAR(GDAL EXPAT_ROOT    --with-expat)
@@ -88,6 +90,7 @@ if(UNIX)
     --with-odbc=no
     --with-ogdi=no
     --with-pam
+    --with-openjpeg
     --with-pcidsk=yes
     --with-pcraster=no
     --with-pcre=no

SuperBuild/CMakeLists.txt

@@ -258,6 +258,9 @@ if(CMAKE_MODULE_LINKER_FLAGS)
   list(APPEND SB_ENV_CONFIGURE_CMD "LDFLAGS=${CMAKE_MODULE_LINKER_FLAGS}")
 endif()
 
+# This is needed for gdal 2.4 in order to find OpenJPEG
+list(APPEND SB_ENV_CONFIGURE_CMD "PKG_CONFIG_PATH=${CMAKE_INSTALL_PREFIX}/lib/pkgconfig")
+
 list(REMOVE_DUPLICATES SB_ENV_CONFIGURE_CMD)
 
 message(STATUS "Environment setup for CMake (SB_CMAKE_COMMAND) : ${SB_CMAKE_COMMAND}")