fixed typo

configure.ac

@@ -64,7 +64,7 @@ AC_ARG_ENABLE(exec,
               AS_HELP_STRING([--disable-exec],
                              [disable UNIX fork and execute with pipes]),
               [have_exec="$enableval"],
-              [if "$MINGW" = "1"; then have_exec="no"; else have_exec="yes"; fi])
+              [if test "$MINGW" = "1"; then have_exec="no"; else have_exec="yes"; fi])
 AM_CONDITIONAL(HAVE_EXEC, test "$have_exec" = "yes")
 AC_ARG_ENABLE(regexp,
               AS_HELP_STRING([--disable-regexp],
@@ -89,7 +89,7 @@ AC_ARG_ENABLE(stacktrace,
               AS_HELP_STRING([--disable-stacktrace],
                              [disable stack trace, use this if you cannot compile the library on your system otherwise and you still want to use the other parts]),
               [have_stacktrace="$enableval"],
-              [if "$MINGW" = "1"; then have_stacktrace="no"; else have_stacktrace="yes"; fi])
+              [if test "$MINGW" = "1"; then have_stacktrace="no"; else have_stacktrace="yes"; fi])
 AM_CONDITIONAL(HAVE_STACKTRACE, test "$have_stacktrace" = "yes")
 if test "$have_stacktrace" = "yes"; then
   # Hack for bug: