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-rw-r--r--lib/mkmf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 644831445..45fc556ec 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -211,7 +211,7 @@ end
def create_tmpsrc(src)
src = yield(src) if block_given?
src = src.sub(/[^\n]\z/, "\\&\n")
- open(CONFTEST_C, "w") do |cfile|
+ open(CONFTEST_C, "wb") do |cfile|
cfile.print src
end
src