#! /bin/shprefix=@prefix@exec_prefix=@exec_prefix@includedir=@includedir@usage(){    cat <<EOFUsage: gsl-config [OPTION]Known values for OPTION are:  --prefix		show GSL installation prefix   --libs		print library linking information, with cblas  --libs-without-cblas	print library linking information, without cblas  --cflags		print pre-processor and compiler flags  --help		display this help and exit  --version		output version informationAn external CBLAS library can be specified using the GSL_CBLAS_LIBenvironment variable. The GSL CBLAS library is used by default.EOF    exit $1}if test $# -eq 0; then    usage 1ficflags=falselibs=falsewhile test $# -gt 0; do    case "$1" in    -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;    *) optarg= ;;    esac    case "$1" in    --prefix=*)	prefix=$optarg	;;    --prefix)	echo $prefix	;;    --version)	echo @VERSION@	exit 0	;;    --help)	usage 0	;;    --cflags)       	echo @GSL_CFLAGS@        	;;    --libs)        : ${GSL_CBLAS_LIB=-lgslcblas}       	echo @GSL_LIBS@ $GSL_CBLAS_LIB -lm       	;;    --libs-without-cblas)       	echo @GSL_LIBS@ -lm       	;;    *)	usage	exit 1	;;    esac    shiftdoneexit 0