This utility script (available on Unix systems) can be used to determine various information about a GDAL installation. It is normally just used by configure scripts for applications using GDAL but can be queried by an end user.
--prefix:
the top level directory for the GDAL installation.
--libs:
The libraries and link directives required to use GDAL.
--cflags:
The include and macro definition required to compiled modules using GDAL.
--version:
Reports the GDAL version.
--ogr-enabled:
Reports "yes" or "no" to standard output depending on whether OGR is built into GDAL.
--formats:
Reports which formats are configured into GDAL to stdout.