Installing ZLIB in Linux Server
Ok, if you are using Debian, you should do:
su
to become root
apt-get update
to refresh the package lists, then
apt-cache search zlib
to check the relevant packages in the lists you have just updated, then
apt-get install <whatever_package_you_found_earlier>
I suggest using regular expression as search strings for apt-cache, since they are more accurate, as in
apt-cache search ^zlib
to return only package names starting with zlib
No zlib.h file in usr/local/include how to get it
Install zlib
with development support by using
sudo apt-get install zlib1g-dev
In case you don't want or need to use the full zlib
, it is fairly easy to write wrapper routines which map the zlib
functions 1:1 to ordinary file functions which don't support compression and decompression.
//
// dummy zlib.h
//
#pragma once
#include <stdio.h>
typedef FILE *gzFile;
int gzclose(gzFile file);
gzFile gzdopen(int fd, const char *mode);
gzFile gzopen(const char *path, const char *mode);
int gzread(gzFile file, void *buf, unsigned int len);
//
// zlibDummy.cpp
//
#include <zlib.h>
int gzclose(gzFile file)
{
return fclose(file);
}
gzFile gzdopen(int fd, const char *mode)
{
return _fdopen(fd, mode);
}
gzFile gzopen(const char *path, const char *mode)
{
return fopen(path, mode);
}
int gzread(gzFile file, void *buf, unsigned int len)
{
return fread(buf, 1, len, file);
}
How to detect whether zlib is available and whether ZIP_DEFLATED is available?
- On Ubuntu if you install Python 3 using apt, e.g.
sudo apt install python3.8
,zlib
will be installed as a dependency. - Another way is to install Python 3 from source code. In this case, you need to install all prerequisites, including
zlib1g-dev
, (and this action is sometimes forgotten to do)
and then compile and install python assudo make install
. Full instructions here - Yes, if
zlib
is not availableimport zlib
will raise exception, such as
>>> import zlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'zlib
There are examples of code like this in the Python standard
library. e.g. in zipfile.py:
try:
import zlib # We may need its compression method
crc32 = zlib.crc32
except ImportError:
zlib = None
crc32 = binascii.crc32
Git installation RHEL Linux failing with warning: zlib.h: No such file or directory
Solved it by wget zlib.net/zlib-1.2.8.tar.gz and installed the same
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