- Don't build/use the execvpe() bundled with libraries/unix.

Unfortunately, we can't completely remove or skip include/execvpe.h
  and cbits/execvpe.c, because they also contain pPrPr_disableITimers(),
  which is called from the Haskell code.

- Switch back to GhcThreaded=YES (default). It's stupid, it's not
  required by GHC (IIRC it was required a long time ago back when
  ghci used libreadline), but it may help finding rthread bugs.
  Until now, I did run four complete builds of GHC and all Haskell
  ports with dpb without any problems.

lang/ghc/Makefile

@@ -1,11 +1,11 @@
-# $OpenBSD: Makefile,v 1.64 2012/02/19 20:38:53 kili Exp $
+# $OpenBSD: Makefile,v 1.65 2012/03/23 20:17:06 kili Exp $
 
 COMMENT-main =		compiler for the functional language Haskell
 COMMENT-doc =		documentation for GHC
 
 DISTNAME =		ghc-${MODGHC_VER}
 PKGNAME-main =		ghc-${MODGHC_VER}
-REVISION-main =		4
+REVISION-main =		5
 PKGNAME-doc =		ghc-doc-${MODGHC_VER}
 REVISION-doc =		0
 CATEGORIES =		lang devel
@@ -79,8 +79,7 @@ CONFIGURE_ARGS +=	--with-gmp-includes=${LOCALBASE}/include \
 
 MAKE_FLAGS +=		StripLibraries=YES \
 			INSTALL_BIN_OPTS=-s \
-			HSCOLOUR_SRCS=NO \
+			HSCOLOUR_SRCS=NO
-			GhcThreaded=NO
 
 # Thank god that they're only building compilers and no nuclear
 # power plants.

lang/ghc/patches/patch-libraries_unix_cbits_execvpe_c

@@ -0,0 +1,28 @@
+$OpenBSD: patch-libraries_unix_cbits_execvpe_c,v 1.1 2012/03/23 20:17:06 kili Exp $
+
+Don't build the included execvpe().
+
+--- libraries/unix/cbits/execvpe.c.orig	Mon Jun 13 19:10:12 2011
++++ libraries/unix/cbits/execvpe.c	Fri Mar 23 18:52:49 2012
+@@ -9,7 +9,7 @@
+ #include "Rts.h"
+ #endif
+ 
+-#if !(defined(_MSC_VER) || defined(__MINGW32__) || defined(_WIN32)) /* to the end */
++#if 0
+ 
+ /* Evidently non-Posix. */
+ /* #include "PosixSource.h" */
+@@ -157,6 +157,7 @@ execvpe(char *name, char *const argv[], char **envp)
+ 	free(buf);
+     return (-1);
+ }
++#endif
+ 
+ 
+ /* Copied verbatim from ghc/lib/std/cbits/system.c. */
+@@ -167,4 +168,3 @@ void pPrPr_disableITimers (void)
+ #endif
+ }
+ 
+-#endif

lang/ghc/patches/patch-libraries_unix_include_execvpe_h

@@ -0,0 +1,15 @@
+$OpenBSD: patch-libraries_unix_include_execvpe_h,v 1.1 2012/03/23 20:17:06 kili Exp $
+
+Don't build the included execvpe().
+
+--- libraries/unix/include/execvpe.h.orig	Mon Jun 13 19:10:12 2011
++++ libraries/unix/include/execvpe.h	Fri Mar 23 18:52:34 2012
+@@ -18,8 +18,5 @@
+ #include <sys/wait.h>
+ #endif
+ 
+-#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_WIN32)
+-extern int execvpe(char *name, char *const argv[], char **envp);
+ extern void pPrPr_disableITimers (void);
+-#endif
+