<?
Header( "Content-type: image/png");

$im = ImageCreate(200, 200);
$black = ImageColorAllocate($im, 0, 0, 0);
$white = ImageColorAllocate($im, 255, 255, 255);

$blue  = ImageColorAllocate($im, 0, 0, 255);
$red   = ImageColorAllocate($im, 255, 0, 0);
$green = ImageColorAllocate($im, 0, 255, 0);

$blue1  = ImageColorAllocate($im, 100, 0, 255);
$red1   = ImageColorAllocate($im, 255,100, 0);
$green1 = ImageColorAllocate($im, 0, 255, 100);

ImageLine($im, 1, 1, 199, 199, $white);
ImageLine($im, 199, 1, 1, 199, $white);

ImageTTFText($im, 36, 0, 1, 30,$blue,  "TEXTBKB.TTF", "TEST TEST");

ImagePng($im);
ImageDestroy($im);
?>

gdb backtrace:

Program received signal SIGSEGV, Segmentation fault.
crc32 (crc=0x4, given_buf=0x400bf660, len=4) at crc32.c:107
107                     (*crc) = ((*crc) << 8) ^ crc32_table[((*crc) >> 24) ^ *p];
(gdb) bt
#0  crc32 (crc=0x4, given_buf=0x400bf660, len=4) at crc32.c:107
#1  0x40091a18 in png_calculate_crc () from /usr/local/lib/libpng.so.2
#2  0x400a2739 in png_write_chunk_start () from /usr/local/lib/libpng.so.2
#3  0x4009ce46 in png_write_IHDR () from /usr/local/lib/libpng.so.2
#4  0x400a53e5 in png_write_info_before_PLTE () from /usr/local/lib/libpng.so.2
#5  0x400a55c2 in png_write_info () from /usr/local/lib/libpng.so.2
#6  0x8145b50 in gdImagePngCtx ()
#7  0x81456c1 in gdImagePng ()
#8  0x809f07b in php_if_imagepng (ht=1, return_value=0x82ef72c, this_ptr=0x0, return_value_used=0) at gd.c:513
#9  0x80f179c in execute (op_array=0x821ced4) at ./zend_execute.c:1574
#10 0x808002b in php_execute_script (primary_file=0xbffff828) at main.c:1198
#11 0x809db20 in apache_php_module_main (r=0x822ad7c, fd=34, display_source_mode=0) at sapi_apache.c:93
#12 0x807c23a in send_php ()
#13 0x807c73b in send_parsed_php ()
#14 0x810eb11 in ap_invoke_handler ()
#15 0x811e011 in process_request_internal ()
#16 0x811e35f in ap_process_request ()
#17 0x8116a41 in child_main ()
#18 0x8116c47 in startup_children ()
#19 0x811745d in standalone_main ()
#20 0x8117dfb in main ()
#21 0x401969cb in __libc_start_main (main=0x81179c4 <main>, argc=2, argv=0xbffffa54, init=0x806373c <_init>, 
    fini=0x814653c <_fini>, rtld_fini=0x4000ae60 <_dl_fini>, stack_end=0xbffffa4c)
    at ../sysdeps/generic/libc-start.c:92