--- ../apertium-es-ro-0.7.1/configure.ac	2007-10-11 21:06:44.000000000 +0200
+++ apertium-es-ro-0.7.1/configure.ac	2010-09-15 17:16:41.000000000 +0200
@@ -12,7 +12,37 @@
 AC_PROG_AWK
 AC_CONFIG_HEADER([config])
 
-PKG_CHECK_MODULES(apertium, [dnl
-  apertium-3.0 >= required_apertium_version])
+AC_DEFUN([PKG_CHECK_APERTIUM], [
+  APERTIUM_VER=0
+  PKG_CHECK_MODULES(APERTIUM, apertium-1.0 >= 1.0.0,
+  [
+      APERTIUM_VER=10
+  ],
+  [
+      PKG_CHECK_MODULES(APERTIUM, apertium-2.0 >= 2.0.0,
+      [
+          APERTIUM_VER=20
+      ],
+      [
+          PKG_CHECK_MODULES(APERTIUM, apertium-3.0 >= 3.0.0,
+          [
+              APERTIUM_VER=30
+          ],
+          [
+              PKG_CHECK_MODULES(APERTIUM, apertium-3.1 >= 3.1.0,
+              [
+                  APERTIUM_VER=31
+              ],
+              [
+                  PKG_CHECK_MODULES(APERTIUM, apertium-3.2 >= 3.2.0)
+                  APERTIUM_VER=32
+              ])
+          ])
+      ])
+  ])
+  AC_SUBST(APERTIUM_VER)
+])
+
+PKG_CHECK_APERTIUM
   
 AC_OUTPUT([Makefile])