spkg-config for pcre

Author: dimpase

build/pkgs/pcre/spkg-configure.m4

@@ -0,0 +1,18 @@
+SAGE_SPKG_CONFIGURE([pcre], [
+    AC_REQUIRE([SAGE_SPKG_CONFIGURE_BZIP2])
+    AC_MSG_CHECKING([Installing bzip2? ])
+    if test x$sage_spkg_install_bzip2 = xyes; then
+       AC_MSG_RESULT([Yes. Install pcre as well.])
+       sage_spkg_install_pcre=yes
+    else
+       AC_MSG_RESULT([No.])
+       dnl First try checking for pcre with pkg-config
+       PKG_CHECK_MODULES([PCRE], [libpcre >= 8.39 libpcreposix libpcrecpp], [], [
+           dnl Fallback to manually grubbing around for headers and libs
+           AC_CHECK_HEADERS([pcre.h pcrecpp.h pcreposix.h], [
+              AC_SEARCH_LIBS([regexec], [pcreposix], [], [sage_spkg_install_pcre=yes])],
+	   [sage_spkg_install_pcre=yes])
+       ])
+    fi
+])
+