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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 aedb376e5c..2c1016da8f 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1299,7 +1299,7 @@ def depend_rules(depend)
depend.each_line do |line|
line.gsub!(/\.o\b/, ".#{$OBJEXT}")
line.gsub!(/\$\((?:hdr|top)dir\)\/config.h/, $config_h) if $config_h
- line.gsub!(%r"\$\(hdrdir\)/(?!ruby(?![^:;/\s]))", '\&ruby/') if /^\s*\w+\s*=/ !~ line
+ line.gsub!(%r"\$\(hdrdir\)/(?!ruby(?![^:;/\s]))(?=[-\w]+\.h)", '\&ruby/')
if /(?:^|[^\\])(?:\\\\)*\\$/ =~ line
(cont ||= []) << line
next