Try to solve Linux compile issue. There is a special place reserved in

my section of hell for the dimwits who decided that switching off_t from
32 to 64 bits was too scary to contemplate.

lib/libvgz/Makefile.am

@@ -3,6 +3,7 @@
 lib_LTLIBRARIES = libvgz.la
 
 libvgz_la_LDFLAGS = -version-info 1:0:0
+libvgz_la_CFLAGS = -D_LARGEFILE64_SOURCE=1
 
 libvgz_la_SOURCES = \
 	adler32.c \

lib/libvgz/vgz.h

@@ -1573,7 +1573,9 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
-#elif !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
+#endif
+
+#if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
 #  define gzopen gzopen64
 #  define gzseek gzseek64
 #  define gztell gztell64