Apparently libtar was poorly programed. An emerge message says so, and a barry
dev claims a compile error is the fault of this libtar.

Whatever, the patch is easy enough =)

--- tarfile-ops-nt.cc.orig	2008-05-05 19:43:36.000000000 -0400
+++ tarfile-ops-nt.cc	2008-05-05 19:50:57.000000000 -0400
@@ -73,7 +73,7 @@
 		return index;
 	}
 
-	int close_compressed(int fd)
+	int close_compressed(long int fd)
 	{
 		unsigned int ufd = fd;
 		assert( ufd < gzArraySize );
@@ -82,14 +82,14 @@
 		return ret;
 	}
 
-	ssize_t read_compressed(int fd, void *buf, size_t size)
+	ssize_t read_compressed(long int fd, void *buf, size_t size)
 	{
 		unsigned int ufd = fd;
 		assert( ufd < gzArraySize );
 		return gzread(gzHandles[ufd], buf, size);
 	}
 
-	ssize_t write_compressed(int fd, const void *buf, size_t size)
+	ssize_t write_compressed(long int fd, const void *buf, size_t size)
 	{
 		unsigned int ufd = fd;
 		assert( ufd < gzArraySize );