$NetBSD: patch-configure,v 1.2 2025/10/02 11:19:51 adam Exp $

Detect asio.hpp from boost.
Use GLEW for GL extensions, works around a linking problem on NetBSD.

--- configure.orig	2025-08-29 15:32:48.000000000 +0000
+++ configure
@@ -9927,7 +9927,7 @@ ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS
 ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
-ac_fn_cxx_check_header_compile "$LINENO" "asio.hpp" "ac_cv_header_asio_hpp" "$ac_includes_default"
+ac_fn_cxx_check_header_compile "$LINENO" "boost/asio.hpp" "ac_cv_header_asio_hpp" "$ac_includes_default"
 if test "x$ac_cv_header_asio_hpp" = xyes
 then :
 
@@ -10670,9 +10670,9 @@ printf %s "checking for OpenGL support..
      SYS_GL_LIBS="-F/System/Library/Frameworks -framework AGL -framework OpenGL"
                   CPPFLAGS="$CPPFLAGS -D__DARWIN__ -F/System/Library/Frameworks -I/System/Library/Frameworks/OpenGL.framework/Headers"  ;; #(
   *-*-linux*) :
-     SYS_GL_LIBS="-lGL -lpthread"  ;; #(
+     SYS_GL_LIBS="-lGLEW -lGL -lpthread"  ;; #(
   *) :
-     SYS_GL_LIBS="-lGL"  ;;
+     SYS_GL_LIBS="-lGLEW -lGL"  ;;
 esac
         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */