Trac #28879: spkg-configure for GSL

URL: https://trac.sagemath.org/28879
Reported by: dimpase
Ticket author(s): Dima Pasechnik
Reviewer(s): Isuru Fernando

build/pkgs/gsl/spkg-configure.m4

@@ -0,0 +1,21 @@
+SAGE_SPKG_CONFIGURE([gsl], [
+    m4_pushdef([SAGE_GSL_MINVER],["2.4"])
+    SAGE_SPKG_DEPCHECK([atlas openblas], [
+      PKG_CHECK_MODULES([GSL], [gsl >= $SAGE_GSL_MINVER], [
+        PKG_CHECK_VAR([GSLPCDIR], [gsl], [pcfiledir], [
+          AC_CONFIG_COMMANDS([GSLPCPROCESS], [
+            $SED -e 's/\${GSL_CBLAS_LIB}\ //' \
+                 -e 's/GSL_CBLAS_LIB.*/Requires: cblas/' $GSL_PC \
+                  > "$SAGE_LOCAL"/lib/pkgconfig/gsl.pc
+          ], [
+            SED=$ac_cv_path_SED
+            GSL_PC="$GSLPCDIR"/gsl.pc
+          ])
+        ], [
+        AC_MSG_WARN([Unable to locate the directory of gsl.pc. This should not happen!])
+       sage_spkg_install_gsl=yes
+       ])
+      ], [sage_spkg_install_gsl=yes])
+    ])
+    m4_popdef([SAGE_GSL_MINVER])
+])