Hopefully, fix to #591.

SciRuby · Dec 14, 2017 · e63cd52 · e63cd52
1 parent 5ea4d7a
commit e63cd52
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/lib/nmatrix/mkmf.rb b/lib/nmatrix/mkmf.rb
@@ -91,8 +91,10 @@ def gplusplus_version
 $CXXFLAGS += " -O3 -std=#{$CXX_STANDARD} " #-fmax-errors=10 -save-temps
 #$CXXFLAGS += " -static -O0 -g -std=#{$CXX_STANDARD} "
 
-CONFIG['warnflags'].gsub!('-Wshorten-64-to-32', '') # doesn't work except in Mac-patched gcc (4.2)
-CONFIG['warnflags'].gsub!('-Wdeclaration-after-statement', '')
-CONFIG['warnflags'].gsub!('-Wimplicit-function-declaration', '')
-
+if CONFIG.has_key?('warnflags')
+  CONFIG['warnflags'].gsub!('-Wshorten-64-to-32', '') # doesn't work except in Mac-patched gcc (4.2)
+  CONFIG['warnflags'].gsub!('-Wdeclaration-after-statement', '')
+  CONFIG['warnflags'].gsub!('-Wimplicit-function-declaration', '')
+end
+
 have_func("rb_array_const_ptr", "ruby.h")