%{prefix}/lib/pkgconfig is split in -dev.

src/context.cr

@@ -197,7 +197,12 @@ class Package::Context
 				prefixes = (@prefixes + [recipe.prefix]).uniq
 
 				split.name = "#{recipe.name}-dev"
-				split.files = prefixes.map { |x| "#{x}/include" }
+				split.files = prefixes.map do |prefix|
+					[
+						"#{prefix}/include",
+						"#{prefix}/lib/pkgconfig"
+					]
+				end.flatten
 				split.file_patterns = prefixes.map do |prefix|
 					Regex.new("^" + prefix + ".*\\.a$")
 				end