diff --git a/cmake/modules/FindNss.cmake b/cmake/modules/FindNss.cmake
index 92e8bca8..5846bf74 100644
--- a/cmake/modules/FindNss.cmake
+++ b/cmake/modules/FindNss.cmake
@@ -18,7 +18,7 @@ if(NSS_INCLUDE_DIRS AND NSS_LDFLAGS)
 
 else()
   if(NOT WIN32)
-    find_package(PkgConfig REQUIRED)
+    find_package(PkgConfig)
     pkg_search_module(NSS nss)
   endif(NOT WIN32)
 
diff --git a/cmake/modules/FindPkcs11Helper.cmake b/cmake/modules/FindPkcs11Helper.cmake
index 9b534a62..5500a262 100644
--- a/cmake/modules/FindPkcs11Helper.cmake
+++ b/cmake/modules/FindPkcs11Helper.cmake
@@ -21,7 +21,7 @@ if(PKCS11H_INCLUDE_DIRS AND PKCS11H_LDFLAGS)
 
 else()
   if(NOT WIN32)
-    find_package(PkgConfig REQUIRED)
+    find_package(PkgConfig)
     pkg_search_module(PKCS11H libpkcs11-helper-1)
   endif(NOT WIN32)