diff --git a/first/ackbuilder.lua b/first/ackbuilder.lua
index f66bcee1d..81e86b528 100644
--- a/first/ackbuilder.lua
+++ b/first/ackbuilder.lua
@@ -729,9 +729,10 @@ definerule("simplerule",
 definerule("installable",
 	{
 		map = { type="targets", default={} },
+		deps = { type="targets", default={} },
 	},
 	function (e)
-		local deps = {}
+		local deps = filenamesof(e.deps)
 		local commands = {}
 		local srcs = {}
 		local outs = {}
diff --git a/first/build.lua b/first/build.lua
index 3240f9f1a..85df519a8 100644
--- a/first/build.lua
+++ b/first/build.lua
@@ -226,6 +226,7 @@ definerule("cprogram",
 	},
 	function (e)
 		local libs = matching(filenamesof(e.deps), "%.a$")
+		local srcs = {}
 		if (#e.srcs > 0) then
 			for _, f in pairs(
 				matching(
@@ -240,7 +241,7 @@ definerule("cprogram",
 					"%.a$"
 				)
 			) do
-				libs[#libs+1] = f
+				srcs[#srcs+1] = f
 			end
 		end
 
@@ -248,7 +249,7 @@ definerule("cprogram",
 			name = e.name,
 			cwd = e.cwd,
 			deps = e.deps,
-			ins = libs,
+			ins = { srcs, libs },
 			outleaves = { e.name },
 			commands = e.commands,
 		}
diff --git a/lang/basic/lib/error.c b/lang/basic/lib/error.c
index b2d893adc..becc69d7a 100644
--- a/lang/basic/lib/error.c
+++ b/lang/basic/lib/error.c
@@ -1,6 +1,9 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+int _errsym;
+int _erlsym;
+
 /* error takes an error value in the range of 0-255 */
 /* and generates a trap */
 
@@ -52,9 +55,6 @@ char *errortable[255]={
 error(index)
 int	index;
 {
-	extern int _errsym;
-	extern int _erlsym;
-
 	_setline();
 	if( index<0 || index >40 )
 		printf("LINE %d:ERROR %d: Unprintable error\n",_erlsym,index);