scons: Ensure generated headers are in the include path.

src/glsl/SConscript

@@ -24,6 +24,9 @@ glcpp_parser = env.CFile('glcpp/glcpp-parse.c', 'glcpp/glcpp-parse.y')
 glsl_lexer = parser_env.CXXFile('glsl_lexer.cpp', 'glsl_lexer.ll')
 glsl_parser = parser_env.CXXFile('glsl_parser.cpp', 'glsl_parser.yy')
 
+# Make glcpp/glcpp-parse.h reacheable from the include path
+env.Append(CPPPATH = [glcpp_parser[0].dir.up()])
+
 sources = [
     glcpp_lexer,
     glcpp_parser[0],

src/mesa/SConscript

@@ -218,6 +218,10 @@ env.Append(YACCFLAGS = '-d')
 program_lex = env.CFile('program/lex.yy.c', 'program/program_lexer.l')
 program_parse = env.CFile('program/program_parse.tab.c',
                           'program/program_parse.y')
+
+# Make program/program_parse.tab.h reacheable from the include path
+env.Append(CPPPATH = [program_parse[0].dir.up()])
+
 program_sources = [
     'program/arbprogparse.c',
     'program/hash_table.c',