Index: src/main.cc
===================================================================
--- a/src/main.cc	(revision 107)
+++ b/src/main.cc	(working copy)
@@ -543,6 +543,10 @@
 
    Log(LOG_startup)   CERR << "locale is: " << locale << "." << endl;
 
+   // ensure that numbers are scanned and printed in
+   // a defined APL-compatible manner, regardless of the locale
+   setlocale(LC_NUMERIC, "C");
+
 const char * dir = bindtextdomain(PACKAGE, LOCALEDIR);
 
    if (dir)