diff --git a/plat/cpm/libsys/build.lua b/plat/cpm/libsys/build.lua
index fb3a3481d..c2a75a4c3 100644
--- a/plat/cpm/libsys/build.lua
+++ b/plat/cpm/libsys/build.lua
@@ -4,6 +4,10 @@ acklibrary {
         "./*.c",
         "./*.s",
     },
+	deps = {
+		"lang/cem/libcc.ansi/headers+headers",
+		"plat/cpm/include+headers",
+	},
     vars = {
         plat = "cpm"
     }
diff --git a/plat/linux386/libsys/build.lua b/plat/linux386/libsys/build.lua
index 9608aab7b..a4d2d7447 100644
--- a/plat/linux386/libsys/build.lua
+++ b/plat/linux386/libsys/build.lua
@@ -5,6 +5,10 @@ acklibrary {
         "plat/linux/libsys/*.c",
         "plat/linux/libsys/*.s",
     },
+	deps = {
+		"lang/cem/libcc.ansi/headers+headers",
+		"plat/linux386/include+headers",
+	},
     vars = {
         plat = "linux386"
     }
diff --git a/plat/linux68k/libsys/build.lua b/plat/linux68k/libsys/build.lua
index 4a8729977..ded71cdd1 100644
--- a/plat/linux68k/libsys/build.lua
+++ b/plat/linux68k/libsys/build.lua
@@ -5,6 +5,10 @@ acklibrary {
         "plat/linux/libsys/*.c",
         "plat/linux/libsys/*.s",
     },
+	deps = {
+		"lang/cem/libcc.ansi/headers+headers",
+		"plat/linux68k/include+headers",
+	},
     vars = {
         plat = "linux68k"
     }
diff --git a/plat/pc86/libsys/build.lua b/plat/pc86/libsys/build.lua
index 909b02930..a30ecae9e 100644
--- a/plat/pc86/libsys/build.lua
+++ b/plat/pc86/libsys/build.lua
@@ -4,6 +4,10 @@ acklibrary {
         "./*.c",
         "./*.s",
     },
+	deps = {
+		"lang/cem/libcc.ansi/headers+headers",
+		"plat/pc86/include+headers",
+	},
     vars = {
         plat = "pc86"
     }