Fix build issues: add missing libraries and includes, fix vpc and cpp issues.

README.md

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+# hl2_src
+Leaked 2017-2018 source engine code.
+
+## Development Setup
+
+### Install Valve Steam Runtime
+```
+sudo mkdir /valve
+sudo chown your-username: /valve
+cd /valve
+wget http://media.steampowered.com/client/runtime/steam-runtime-sdk_latest.tar.xz
+tar xvf steam-runtime-sdk_latest.tar.xz
+rm steam-runtime-sdk_latest.tar.xz
+mv steam-runtime-sdk_* steam-runtime
+cd steam-runtime
+```
+
+```
+$ ./setup.sh
+======================================
+Which architectures would you like to target?
+    1) i386 (x86 32-bit)
+    2) amd64 (x64 64-bit)
+    3) all supported architectures
+Default i386: 1
+Set target architecture to: i386
+
+======================================
+Which runtime flavor would you like to use?
+    1) release
+    2) debug
+Default release: 1
+Set runtime flavor to: release
+
+======================================
+Update base SDK? [Y/n]: Y
+Installing http://media.steampowered.com/client/runtime/steam-runtime-sdk_latest.tar.xz...
+##################################################################################################################################### 100.0%
+
+======================================
+Update tools? [Y/n]: Y
+Installing http://media.steampowered.com/client/runtime/x-tools-amd64-i386_latest.tar.xz...
+##################################################################################################################################### 100.0%
+
+======================================
+Update runtime? [Y/n]: Y
+Installing http://media.steampowered.com/client/runtime/steam-runtime-dev-release_latest.tar.xz...
+##################################################################################################################################### 100.0%
+
+======================================
+Update complete!
+```
+
+Ensure that /bin is part of PATH by patching shell.sh:
+```
+sed -i 's#export PATH="${TOP}/bin:$PATH"#export PATH="${TOP}/bin:$PATH:/bin"#' /valve/steam-runtime/shell.sh
+```
+
+### Enable Valve Steam Runtime
+**Must be enabled each time you work with the source engine.**
+
+`/valve/steam-runtime/shell.sh --arch=i386`
+
+---
+
+##### Build devtools/vpc_linux
+
+Optional (already done in this repo)
+
+```
+cd external/vpc/utils/vpc
+make -j
+```
+
+## Configuring
+
+cstrike on linux:
+```
+devtools/bin/vpc /f /linux32 /define:NO_AUTO_P4 +everything -physics -bugreporter_filequeue -itemtest_com -itemtest_lib -sdktoolslib -vaudio_miles -video_bink -video_quicktime -video_webm -simdtest -gcsdk -panel_zoo -stdshader_dbg /cstrike /mksln cstrike
+```
+
+cstrike dedicated on linux:
+```
+devtools/bin/vpc_linux /f /linux32 /define:NO_AUTO_P4 +dedicated -physics -gcsdk /cstrike /dedicated /mksln cstrike_dedicated
+```
+
+## Building
+
+cstrike:
+`make -f cstrike.mak`
+
+cstrike_dedicated:
+`make -f cstrike_dedicated.mak`
+
+## Game content
+
+### Download from Steam Depot
+
+[SteamDB 240](https://steamdb.info/app/240/depots/)
+
+[SteamRE/DepotDownloader](https://github.com/SteamRE/DepotDownloader)
+
+Grab the latest release.
+Install mono and run:
+
+`mono DepotDownloader.dll -app 240 -username xxx -password xxx`
+