https://bugs.gentoo.org/670020

--- a/src/FbiStuffJpeg.cpp
+++ b/src/FbiStuffJpeg.cpp
@@ -115,7 +115,7 @@
     cinfo->src->bytes_in_buffer = h->tsize;
 }*/
 
-static int thumbnail_src_fill(struct jpeg_decompress_struct *cinfo)
+static boolean thumbnail_src_fill(struct jpeg_decompress_struct *cinfo)
 {
     FIM_FBI_PRINTF("jpeg: panic: no more thumbnail input data\n");
     exit(1);
--- a/src/FramebufferDevice.h
+++ b/src/FramebufferDevice.h
@@ -37,8 +37,8 @@
 #include "DisplayDevice.h"
 
 /* these are required by FbiStuffJpeg.cpp */
-#define FIM_FBI_TRUE            1
-#define FIM_FBI_FALSE           0
+#define FIM_FBI_TRUE            TRUE
+#define FIM_FBI_FALSE           FALSE
 
 #ifndef FIM_WITH_NO_FRAMEBUFFER