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-rw-r--r--spec/ruby/optional/capi/spec_helper.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/spec/ruby/optional/capi/spec_helper.rb b/spec/ruby/optional/capi/spec_helper.rb
index ec6b909397..2691aa1332 100644
--- a/spec/ruby/optional/capi/spec_helper.rb
+++ b/spec/ruby/optional/capi/spec_helper.rb
@@ -34,7 +34,8 @@ def compile_extension(name)
abi_header = "#{rubyhdrdir}/ruby/internal/abi.h"
if RbConfig::CONFIG["ENABLE_SHARED"] == "yes"
- libdirname = RbConfig::CONFIG['libdirname'] # defined since 2.1
+ # below is defined since 2.1, except for mswin, and maybe other platforms
+ libdirname = RbConfig::CONFIG.fetch 'libdirname', 'libdir'
libruby = "#{RbConfig::CONFIG[libdirname]}/#{RbConfig::CONFIG['LIBRUBY']}"
end