Argh, I think I apt-get updated and my compiler updated yesterday and now I get
the following error:

/bin/sh ../libtool --tag=CC   --mode=link gcc -fvisibility=hidden -DNO_MALLOCT
-DZLIB_CONST -O0 -g3  -L/usr/lib -o proxytrack proxy/proxytrack-main.o
proxy/proxytrack-proxytrack.o proxy/proxytrack-store.o proxytrack-coucal.o
proxytrack-htsmd5.o proxytrack-md5.o minizip/proxytrack-ioapi.o
minizip/proxytrack-mztools.o minizip/proxytrack-unzip.o
minizip/proxytrack-zip.o -lpthread  -lz 
libtool: link: gcc -fvisibility=hidden -DNO_MALLOCT -DZLIB_CONST -O0 -g3 -o
proxytrack proxy/proxytrack-main.o proxy/proxytrack-proxytrack.o
proxy/proxytrack-store.o proxytrack-coucal.o proxytrack-htsmd5.o
proxytrack-md5.o minizip/proxytrack-ioapi.o minizip/proxytrack-mztools.o
minizip/proxytrack-unzip.o minizip/proxytrack-zip.o  -L/usr/lib -lpthread -lz
proxytrack-htsmd5.o: In function `abortf_':
/home/fran/source/httrack/src/htssafe.h:96: undefined reference to
`hts_get_error_callback'
collect2: error: ld returned 1 exit status
Makefile:567: recipe for target 'proxytrack' failed
make[2]: *** [proxytrack] Error 1
make[2]: Leaving directory '/home/fran/source/httrack/src'
Makefile:343: recipe for target 'all-recursive' failed

$ gcc --version
gcc (Debian 4.8.3-2) 4.8.3

$ libtool --version
libtool (GNU libtool) 2.4.2