Minimum version: none
Install on Debian: `apt-get install libidn11-dev`
+=libidn2=
+ Provides IDNA support in URLs (fallback if libidn is not available).
+ Minimum version: none
+ Install on Debian: `apt-get install libidn2-0-dev`
+
+=libicu=
+ Provides IDNA support in URLs (fallback if libidn is not available).
+ Minimum version: none
+ Install on Debian: `apt-get install libicu-dev`
+
=libcurl=
Provides HTTP request functionality.
Minimum version: 7.18.2
--------|-------
2.0.4 | Dropped the pecl/event conflict.
2.4.0 | Dropped the ext/json dependency.
+2.4.2 | Added libidn2 and libicu as fallback for IDNA support.