Give a warning if SO is set. Fixes #610332.
diff --git a/configure.in b/configure.in
index 963c664..4021728 100644
--- a/configure.in
+++ b/configure.in
@@ -1140,6 +1140,17 @@
CYGWIN*) SO=.dll;;
*) SO=.so;;
esac
+else
+ # this might also be a termcap variable, see #610332
+ echo
+ echo '====================================================================='
+ echo '+ +'
+ echo '+ WARNING: You have set SO in your environment. +'
+ echo '+ Do you really mean to change the extension for shared libraries? +'
+ echo '+ Continuing in 10 seconds to let you to ponder. +'
+ echo '+ +'
+ echo '====================================================================='
+ sleep 10
fi
AC_MSG_RESULT($SO)
# LDSHARED is the ld *command* used to create shared library