[Mapserver-users] libpq.so.2 vs. libpq.so.3 problems

[Dylan Keon]

When MapServer is compiled with PostGIS support, does it require 
libpq.so.2 even if libpq.so.3 is available?  I replaced Postgres 7.2.3 
with 7.4.1 today (along with the current PostGIS and GEOS builds), 
recompiled MapServer to point to the new pg_config, and get the 
following error:

# ./mapserv -v
./mapserv: error while loading shared libraries: libpq.so.2: cannot open 
shared object file: No such file or directory

I was able to restore the old libpq.so.2 and currently have it sitting 
alongside libpq.so.3.  In that case ./mapserv -v works:

./mapserv -v
MapServer version 4.0.1 OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP OUTPUT=PDF 
SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT 
SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT INPUT=EPPL7
INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE fine:

Is there any problem with using both libraries side-by-side?  I just 
don't understand why MapServer needs both:

ldd ./mapserv
         libgd.so.2 => /usr/local/lib/libgd.so.2 (0x40022000)
         libfreetype.so.6 => /usr/local/lib/libfreetype.so.6 (0x40073000)
         libpng12.so.0 => /usr/local/lib/libpng12.so.0 (0x400bd000)
         libXpm.so.4 => /usr/X11R6/lib/libXpm.so.4 (0x400f0000)
         libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x400ff000)
         libpdf.so.1 => /usr/local/lib/libpdf.so.1 (0x401dd000)
         libproj.so.0 => /usr/local/lib/libproj.so.0 (0x4026b000)
         libgdal.1.1.so => /usr/local/lib/libgdal.1.1.so (0x4029a000)
         libm.so.6 => /lib/i686/libm.so.6 (0x40547000)
         libdl.so.2 => /lib/libdl.so.2 (0x40569000)
         libpq.so.3 => /usr/local/lib/libpq.so.3 (0x4056c000)
         libcurl.so.2 => /usr/local/lib/libcurl.so.2 (0x40582000)
         libpthread.so.0 => /lib/i686/libpthread.so.0 (0x405a4000)
         libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x405f5000)
         libc.so.6 => /lib/i686/libc.so.6 (0x42000000)
         libpq.so.2 => not found
         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x406a7000)
         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
         libcrypt.so.1 => /lib/libcrypt.so.1 (0x406af000)
         libresolv.so.2 => /lib/libresolv.so.2 (0x406dd000)
         libnsl.so.1 => /lib/libnsl.so.1 (0x406ef000)
         libz.so.1 => /usr/lib/libz.so.1 (0x40705000)
         libssl.so.2 => /lib/libssl.so.2 (0x40713000)
         libcrypto.so.2 => /lib/libcrypto.so.2 (0x40743000)


Thanks,
Dylan