Merge pull request #198 from sureshsundriyal/wip

[autogen] Honor environment variables and prefer autoreconf.

autogen.sh

@@ -1,9 +1,21 @@
 #! /bin/sh
 
-autoconf --version
-automake --version
 
-aclocal -I m4 -I .
-autoheader -I .
-automake --add-missing --copy --force-missing --foreign
-autoconf
+AUTORECONF=${AUTORECONF:-$(which autoreconf)}
+
+if [ -n ${AUTORECONF} ]; then
+    ${AUTORECONF} -vfi -I m4
+else
+    AUTOCONF=${AUTOCONF:-$(which autoconf)}
+    AUTOMAKE=${AUTOMAKE:-$(which automake)}
+    AUTOHEADER=${AUTOHEADER:-$(which autoheader)}
+    ACLOCAL=${ACLOCAL:-$(which aclocal)}
+
+    ${AUTOCONF} --version
+    ${AUTOMAKE} --version
+
+    ${ACLOCAL} -I m4 -I .
+    ${AUTOHEADER} -I .
+    ${AUTOMAKE} --add-missing --copy --force-missing --foreign
+    ${AUTOCONF}
+fi