/usr/bin/gadap-config is in libgadap-dev 2.0-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Borrowed the idea for this script (and some code) from nc-dap which in
# turn took it from libcurl.
# This version now derives out of the pkg-config file (preferred)
usage()
{
    cat <<EOF
Usage: gadap-config [OPTION]
Available values for OPTION include:
  --help      display this help message and exit
  --cc        C compiler
  --cxx       C++ compiler
  --cflags    pre-processor and compiler flags
  --libs      library linking information for libgadap
  --prefix    Install prefix
  --version   Library version
EOF
    exit $1
}
if test $# -eq 0; then
    usage 1
fi
while test $# -gt 0; do
    case "$1" in
    # this deals with options in the style
    # --option=value and extracts the value part
    # [not currently used]
    -*=*) value=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *) value= ;;
    esac
    case "$1" in
    --help)
	usage 0
	;;
    --cc)
	pkg-config --variable=cc gadap
	;;
    --cxx)
	pkg-config --variable=cxx gadap
	;;
    --cflags)
	pkg-config --cflags gadap
	;;
    --libs)
       	pkg-config --libs gadap
       	;;
    --prefix)
	pkg-config --variable=prefix gadap
       	;;
    --version)
	echo "libgadap 2.0"
	;;
    *)
        echo "unknown option: $1"
	usage
	exit 1
	;;
    esac
    shift
done
exit 0
 |