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-rw-r--r--Library/Formula/io.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/Library/Formula/io.rb b/Library/Formula/io.rb
index 462347d84..946d51889 100644
--- a/Library/Formula/io.rb
+++ b/Library/Formula/io.rb
@@ -10,6 +10,7 @@ class Io < Formula
option "without-addons", "Build without addons"
depends_on "cmake" => :build
+ depends_on "pkg-config" => :build
if build.with? "addons"
depends_on "glib"