Build fixes from http://www.linuxfromscratch.org/blfs/view/7.4/pst/xsane.html

diff -Nur xsane-0.998.old/src/xsane.h xsane-0.998/src/xsane.h
--- xsane-0.998.old/src/xsane.h	2010-11-16 19:00:33.000000000 -0200
+++ xsane-0.998/src/xsane.h	2015-08-04 08:37:32.854957004 -0300
@@ -251,7 +251,7 @@
 # elif defined(HAVE_OS2_H)
 #  define DEFAULT_BROWSER "netscape"
 # else
-#  define DEFAULT_BROWSER "netscape"
+#  define DEFAULT_BROWSER "xdg-open"
 # endif
 #endif
 
Binary files xsane-0.998.old/src/xsane.h.gch and xsane-0.998/src/xsane.h.gch differ
diff -Nur xsane-0.998.old/src/xsane-save.c xsane-0.998/src/xsane-save.c
--- xsane-0.998.old/src/xsane-save.c	2010-11-16 19:06:00.000000000 -0200
+++ xsane-0.998/src/xsane-save.c	2015-08-04 08:38:05.344956080 -0300
@@ -4910,7 +4910,7 @@
     return -1; /* error */
   }
 
-  if (setjmp(png_ptr->jmpbuf))
+  if (setjmp(png_jmpbuf(png_ptr)))
   {
     snprintf(buf, sizeof(buf), "%s %s", ERR_DURING_SAVE, ERR_LIBPNG);
     xsane_back_gtk_error(buf, TRUE);
@@ -5100,7 +5100,7 @@
     return -1; /* error */
   }
 
-  if (setjmp(png_ptr->jmpbuf))
+  if (setjmp(png_jmpbuf(png_ptr)))
   {
     snprintf(buf, sizeof(buf), "%s %s", ERR_DURING_SAVE, ERR_LIBPNG);
     xsane_back_gtk_error(buf, TRUE);