Added recipes for some Linux system libraries.

recipes/zlib/recipe.py

@@ -6,6 +6,16 @@ from SCons.Script import *
 _REPO_NAME = 'zlib'
 _REPO_URL = 'https://github.com/madler/zlib.git'
 _TAG_PATTERN = re.compile(r'^v([0-9]+)\.([0-9]+)(?:\.([0-9]+))?$')
+_VERSION_SOURCE = '''
+    #include <zlib.h>
+    #include <stdio.h>
+    
+    int main(int, char**)
+    {
+        puts(ZLIB_VERSION);
+        return 0;
+    }
+'''
 
 def _build_lib_name(env: Environment) -> str:
     if os.name == 'posix':
@@ -17,19 +27,29 @@ def _build_lib_name(env: Environment) -> str:
     else:
         raise Exception('libpng is not supported yet on this OS')
 
-def versions(env: Environment, update: bool = False):
+def versions(env: Environment, update: bool = False, options: dict = {}):
     tags = env.GitTags(repo_name = _REPO_NAME, remote_url = _REPO_URL, force_fetch=update)
     result = []
-    for tag in tags:
-        match = _TAG_PATTERN.match(tag)
-        if match:
-            result.append((int(match.groups()[0]), int(match.groups()[1]), int(match.groups()[2] or 0)))
+
+    if options.get('use_system_library'):
+        version = env.VersionFromSource('pkgconf --cflags-only-I zlib', _VERSION_SOURCE)
+        if version:
+            env['SYSTEM_ZLIB_VERSION'] = version
+            result.append(version)
+    else:
+        for tag in tags:
+            match = _TAG_PATTERN.match(tag)
+            if match:
+                result.append((int(match.groups()[0]), int(match.groups()[1]), int(match.groups()[2] or 0)))
     return result
 
 def dependencies(env: Environment, version) -> 'dict':
     return {}
 
-def cook(env: Environment, version) -> dict:
+def cook(env: Environment, version, options: dict = {}) -> dict:
+    if options.get('use_system_library'):
+        return env.PkgCook('pkgconf --cflags --libs zlib')
+    
     git_ref = f'refs/tags/v{version[0]}.{version[1]}'
     if version[2] != 0:
         git_ref = git_ref + f'.{version[2]}'