Bug 25502

Description of problem:
I'am trying to install the sf module for R (https://cran.r-project.org/web/packages/sf/), and the configure returns a gdal error

here is the source code from the configure :

cat > gdal_proj.cpp <<_EOCONF
#include <gdal.h>
#include <ogr_srs_api.h>
#include <ogr_spatialref.h>
int main(int argc, char *argv[]) {
        OGRSpatialReference *dest = new OGRSpatialReference;
        OGRSpatialReference *src = new OGRSpatialReference;
    src->importFromEPSG(4326);
    dest->importFromEPSG(3857);
        OGRCoordinateTransformation *ct = OGRCreateCoordinateTransformation(src, dest);
        return(ct == NULL); // signals PROJ is not available through gdal
}
_EOCONF

g++ -I/usr/include/gdal -o gdal_proj gdal_proj.cpp -lgdal

prompt> ./gdal_proj
ERROR 6: Unable to load PROJ.4 library (libproj.so.13), creation of OGRCoordinateTransformation failed.

looking into gdal-2.4.1-2.mga7.src.rpm, the problem seems to come frome gdal-2.3.1-libname.patch patch

    --- gdal-2.3.1/ogr/ogrct.cpp~        2018-06-23 17:09:11.000000000 +0200
    +++ gdal-2.3.1/ogr/ogrct.cpp        2018-07-30 15:55:10.059763422 +0200
    @@ -124,7 +124,7 @@
     #elif defined(__APPLE__)
     #  define LIBNAME "libproj.dylib"
     #else
    -#  define LIBNAME "libproj.so"
    +#  define LIBNAME "libproj.so.13"
     #endif
 
     #endif // PROJ_VERSION == 4

on mageia 7, I have libproj.so.15 (linked to libproj.so)

$ ls /usr/lib64/libproj.so*
/usr/lib64/libproj.so@     /usr/lib64/libproj.so.15.1.0*
/usr/lib64/libproj.so.15@


If gdal rpm packlage is built without the gdal-2.3.1-libname.patch, the sf configure code does not return any more error


Version-Release number of selected component (if applicable):
gdal-2.4.1-2.mga7.src.rpm

How reproducible:
every time

Steps to Reproduce:
1. compile test code : g++ -I/usr/include/gdal -o gdal_proj gdal_proj.cpp -lgdal
2. execute test binary : ./gdal_proj
3.