gentoo-overlay/games-simulation/crrcsim/files/crrcsim-buildsystem.patch

--- crrcsim-0.9.11/configure.ac
+++ crrcsim-0.9.11/configure.ac
@@ -79,8 +79,12 @@
 dnl Default is: no portaudio present
 portaudio=0
 
+AC_ARG_WITH([portaudio], AS_HELP_STRING([--without-portaudio], [Build without portaudio library (default: test)]))
+
+AS_IF([test "x$with_portaudio" != "xno"], [
 dnl Check for the Portaudio header file
 AC_CHECK_HEADER([portaudio.h])
+])
 
 if  (test "x$ac_cv_header_portaudio_h" = "xyes"); then 
   dnl Check for Portaudio 18