Merge branch 'pike-modules/sass' into 8.0

* pike-modules/sass:
  Sass: Survive old libsass.

src/post_modules/_Sass/configure.in

@@ -62,6 +62,16 @@ AS_IF(
 	#
 	# Check for features in libsass
 	#
+
+	# NB: Not available in the libsass in Ubuntu 16.04 (3.3.4-1).
+	AC_CHECK_LIB(
+	    sass, sass_copy_c_string,
+	    [
+		#LIBS="${LIBS-} -lsass"
+		AC_DEFINE(HAVE_LIBSASS_COPY_C_STRING, [1],
+			  [Defined if sass_copy_c_string is available ])
+	    ])
+
 	AC_CHECK_LIB(
 	    sass, sass_delete_options,
 	    [

src/post_modules/_Sass/sass.cmod

@@ -24,6 +24,17 @@ DECLARATIONS
 #include "pike_sass.h"
 #include <sass.h>
 
+#ifndef HAVE_LIBSASS_COPY_C_STRING
+static char *sass_copy_c_string(const char *str)
+{
+  size_t len = strlen(str);
+  char *res = malloc(len+1);
+  if (!res) return NULL;
+  memcpy(res, str, len+1);
+  return res;
+}
+#endif /* !HAVE_LIBSASS_COPY_C_STRING */
+
 /*! @module Web
  */
 /*! @module Sass