After fixing a bug in gvcext.h (which is not Haiku specific),

GraphViz builds fine now in shared library mode. Perl bindings is still disable, as
I didn't have time and the will to test this.
The default font is hardcoded to Haiku's default one.

These changes could probably be backported to 2.24 too, but why maintining olded 2.24?

media-gfx/graphviz/graphviz-2.26.3.bep

@@ -1,5 +1,5 @@
-DESCRIPTION="graphviz - Open Source Graph Visualization Software." 
-HOMEPAGE="http://www.graphviz.org/" 
+DESCRIPTION="graphviz - Open Source Graph Visualization Software."
+HOMEPAGE="http://www.graphviz.org/"
 SRC_URI="http://www.graphviz.org/pub/graphviz/stable/SOURCES/graphviz-2.26.3.tar.gz"
 CHECKSUM_MD5="6f45946fa622770c45609778c0a982ee"
 REVISION="1"
@@ -9,15 +9,13 @@ BUILD {
 	cd graphviz-2.26.3
 	libtoolize --force --copy --install
 	autoconf
-	./configure --prefix=/boot/common --disable-shared --enable-static --disable-perl CFLAGS="-O0" LDFLAGS="-L/boot/common/lib -liconv"
+	./configure --prefix=/boot/common --enable-shared --disable-perl 
 	make
 }
 
 INSTALL {
 	cd graphviz-2.26.3
 	make install
-	cd ${DESTDIR}/boot/common/bin
-	ln -s dot_static dot
 }
 LICENSE="CPL v1.0"
 COPYRIGHT="1994-2010 AT&T Corp."

media-gfx/graphviz/patches/graphviz-2.26.3.patch

@@ -4,7 +4,7 @@ diff -up graphviz-2.26.3/config.h.in.orig graphviz-2.26.3/config.h.in
 @@ -427,6 +427,9 @@
  /* Define to 1 if you have struct dioattr */
  #undef HAVE_STRUCT_DIOATTR
- 
+
 +/* Define to 1 if you have the <sysexits.h> header file. */
 +#undef HAVE_SYSEXITS_H
 +
@@ -14,13 +14,13 @@ diff -up graphviz-2.26.3/config.h.in.orig graphviz-2.26.3/config.h.in
 @@ -578,6 +581,9 @@
  /* Define to the one symbol short name of this package. */
  #undef PACKAGE_TARNAME
- 
+
 +/* Define to the home page for this package. */
 +#undef PACKAGE_URL
 +
  /* Define to the version of this package. */
  #undef PACKAGE_VERSION
- 
+
 diff -up graphviz-2.26.3/configure.ac.orig graphviz-2.26.3/configure.ac
 --- graphviz-2.26.3/configure.ac.orig	2010-01-26 09:00:29.029622272 -0700
 +++ graphviz-2.26.3/configure.ac	2010-03-18 18:03:33.265289728 -0600
@@ -82,9 +82,52 @@ diff -up graphviz-2.26.3/lib/gd/gd_png.c.orig graphviz-2.26.3/lib/gd/gd_png.c
 @@ -150,7 +150,7 @@ BGD_DECLARE(gdImagePtr) gdImageCreateFro
  	return NULL;
    }
- 
+
 -	if (!png_check_sig (sig, 8)) { /* bad signature */
 +	if (png_sig_cmp(sig, 0, 8)) { /* bad signature */
      	return NULL;		/* bad signature */
  	}
- 
+
+diff -up graphviz-2.26.3/lib/gvc/gvcext.h.orig graphviz-2.26.3/lib/gvc/gvcext.h
+--- graphviz-2.26.3/lib/gvc/gvcext.h.orig       2009-07-08 17:14:20.054525952 +0200
++++ graphviz-2.26.3/lib/gvc/gvcext.h    2011-04-13 19:38:04.150470656 +0200
+@@ -65,6 +65,9 @@ extern "C" {
+
+     typedef struct gvplugin_available_s gvplugin_available_t;
+
++#undef lt_preloaded_symbols
++#define lt_preloaded_symbols lt_GRAPHVIZ_LTX_preloaded_symbols
++
+ /*visual studio*/
+ #ifdef WIN32_DLL
+ #ifndef GVC_EXPORTS
+diff -up graphviz-2.26.3/lib/vmalloc/vmhdr.h.orig graphviz-2.26.3/lib/vmalloc/vmhdr.h
+--- graphviz-2.26.3/lib/vmalloc/vmhdr.h.orig	2009-06-03 03:10:55.040894464 +0200
++++ graphviz-2.26.3/lib/vmalloc/vmhdr.h	2011-04-04 18:51:05.289931264 +0200
+@@ -54,6 +54,10 @@ extern "C" {
+ #include	<ast_common.h>
+ #include	"FEATURE/vmalloc"
+
++#ifdef __HAIKU__
++	#undef _hdr_malloc
++#endif
++
+ #endif /*_PACKAGE_ast*/
+
+ #undef free
+diff -up graphviz-2.26.3/lib/common/const.h.orig graphviz-2.26.3/lib/common/const.h
+--- graphviz-2.26.3/lib/common/const.h.orig	2009-08-28 21:46:42.059506688 +0200
++++ graphviz-2.26.3/lib/common/const.h	2011-02-18 18:48:44.856162304 +0100
+@@ -67,7 +67,11 @@
+ #define		DEFAULT_FONTSIZE	14.0
+ #define		DEFAULT_LABEL_FONTSIZE	11.0	/* for head/taillabel */
+ #define		MIN_FONTSIZE		1.0
+-#define		DEFAULT_FONTNAME	"Times-Roman"
++#ifdef __HAIKU__
++	#define		DEFAULT_FONTNAME	"DejaVuSans"
++#else
++	#define		DEFAULT_FONTNAME	"Times-Roman"
++#endif
+ #define		DEFAULT_FILL		"lightgrey"
+ #define         LINESPACING             1.20
+