`src/gzip/rules.mk` compiles the internal zlib sources even when using the
zlib development files provided by a host system. If the internal zlib
development files are not present, FreeType fails to build from source.
This patch ensures the internal zlib development files are only
prerequisites when not using zlib development files on a host system.
* src/gzip/rules.mk (GZIP_DRV_SRCS): Define conditionally.
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Name: zlib
Short Name: zlib
URL: http://zlib.net/
Version: 1.2.13
License: see `zlib.h`
Description:
"A massively spiffy yet delicately unobtrusive compression library."
'zlib' is a free, general-purpose, legally unencumbered lossless
data-compression library. 'zlib' implements the "deflate"compression
algorithm described by RFC 1951, which combines the LZ77 (Lempel-Ziv)
algorithm with Huffman coding. zlib also implements the zlib (RFC 1950) and
gzip (RFC 1952) wrapper formats.
Local Modifications:
The files in this directory have been prepared as follows.
- Take the unmodified source code files from the zlib distribution that are
included by `ftgzip.c`.
- Copy `zconf.h` to `ftzconf.h` (which stays unmodified otherwise).
- Run zlib's `zlib2ansi` script on all `.c` files.
- Apply the diff file(s) in the `patches` folder.
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