Description:
When using leptonica 1.69-2 with libwebp 0.1.99-1 it is missing libwebp.so.2. This is because libwebp 0.1.99-1 has version libwebp.so.3. If you downgrade libwebp to 0.1.3-2, the dependency is met, and leptonica is again fully functional.

When compiling with the current setup I get errors such as:

/usr/bin/ld: warning: libwebp.so.2, needed by /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../../lib/liblept.so, not found (try using -rpath or -rpath-link)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../../lib/liblept.so: undefined reference to `WebPDecodeRGBAInto'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../../lib/liblept.so: undefined reference to `WebPEncodeRGBA'
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../../lib/liblept.so: undefined reference to `WebPGetInfo'
collect2: error: ld returned 1 exit status

These dissapear with the older version of libwebp


Additional info:
* leptonica 1.69-2
* libwebp 0.1.99-1 does not work
* libwebp 0.1.3-2 does work
$ ldd -r /lib/liblept.so
linux-vdso.so.1 (0x00007fff5fc82000)
libm.so.6 => /lib/libm.so.6 (0x00007ff175e13000)
libz.so.1 => /lib/libz.so.1 (0x00007ff175bfd000)
libpng15.so.15 => /lib/libpng15.so.15 (0x00007ff1759cf000)
libjpeg.so.8 => /lib/libjpeg.so.8 (0x00007ff17577e000)
libgif.so.4 => /lib/libgif.so.4 (0x00007ff175574000)
libtiff.so.5 => /lib/libtiff.so.5 (0x00007ff175301000)
libwebp.so.2 => not found
libc.so.6 => /lib/libc.so.6 (0x00007ff174f5d000)
libX11.so.6 => /lib/libX11.so.6 (0x00007ff174c23000)
liblzma.so.5 => /lib/liblzma.so.5 (0x00007ff174a00000)
/lib/ld-linux-x86-64.so.2 (0x00007ff1764e6000)
libxcb.so.1 => /lib/libxcb.so.1 (0x00007ff1747e2000)
libdl.so.2 => /lib/libdl.so.2 (0x00007ff1745dd000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007ff1743c1000)
libXau.so.6 => /lib/libXau.so.6 (0x00007ff1741bd000)
libXdmcp.so.6 => /lib/libXdmcp.so.6 (0x00007ff173fb6000)
undefined symbol: WebPGetInfo (/lib/liblept.so)
undefined symbol: WebPDecodeRGBAInto (/lib/liblept.so)
undefined symbol: WebPEncodeRGBA (/lib/liblept.so)


Steps to reproduce:
Install leptonica with all it's dependencies, in my case this will be (among others) leptonica 1.69-2 and libwebp 0.1.99-1.
Run `ldd -r /lib/liblept.so` to see that the libwebp dependency is not met.