diff --git a/var/spack/repos/spack_repo/builtin/packages/lemon/package.py b/var/spack/repos/spack_repo/builtin/packages/lemon/package.py
index 2dd5c3f87d9..1b442a7d972 100644
--- a/var/spack/repos/spack_repo/builtin/packages/lemon/package.py
+++ b/var/spack/repos/spack_repo/builtin/packages/lemon/package.py
@@ -22,7 +22,8 @@ class Lemon(CMakePackage):
     # soplex not mentioned in docs but shown in cmakecache
     # variant("soplex", default=False, description="Enable SOPLEX solver backend") #TODO
 
-    depends_on("cxx", type="build")  # generated
+    depends_on("c", type="build")
+    depends_on("cxx", type="build")
 
     depends_on("glpk", when="+glpk")
     depends_on("cplex", when="+ilog")
diff --git a/var/spack/repos/spack_repo/builtin/packages/qjson/package.py b/var/spack/repos/spack_repo/builtin/packages/qjson/package.py
index 3a7c09b8a2b..23f45a0dadc 100644
--- a/var/spack/repos/spack_repo/builtin/packages/qjson/package.py
+++ b/var/spack/repos/spack_repo/builtin/packages/qjson/package.py
@@ -16,7 +16,8 @@ class Qjson(CMakePackage):
 
     version("0.9.0", sha256="e812617477f3c2bb990561767a4cd8b1d3803a52018d4878da302529552610d4")
 
-    depends_on("cxx", type="build")  # generated
+    depends_on("c", type="build")
+    depends_on("cxx", type="build")
 
     depends_on("qt")
 
diff --git a/var/spack/repos/spack_repo/builtin/packages/qtkeychain/package.py b/var/spack/repos/spack_repo/builtin/packages/qtkeychain/package.py
index e1228f36b4b..5c7e9ee6eff 100644
--- a/var/spack/repos/spack_repo/builtin/packages/qtkeychain/package.py
+++ b/var/spack/repos/spack_repo/builtin/packages/qtkeychain/package.py
@@ -15,7 +15,8 @@ class Qtkeychain(CMakePackage):
 
     version("0.9.1", sha256="9c2762d9d0759a65cdb80106d547db83c6e9fdea66f1973c6e9014f867c6f28e")
 
-    depends_on("cxx", type="build")  # generated
+    depends_on("c", type="build")
+    depends_on("cxx", type="build")
 
     depends_on("qt+dbus")
     depends_on("libsecret")