Ubuntu 18.04.03 - Building SDL2 fails

[PJaros]

According to https://github.com/nesbox/TIC-80/wiki/build-instructions I should be able compile this with the instructions:

sudo apt-get install git 
git clone --recursive https://github.com/nesbox/TIC-80
cd TIC-80
cmake .
make

But I fail at cmake .

Here is what I habve in the console. I've also attached the generated log file

madmike@desktop:~/git$ git clone --recursive https://github.com/nesbox/TIC-80
Klone nach 'TIC-80' ...
remote: Enumerating objects: 101, done.
remote: Counting objects: 100% (101/101), done.
remote: Compressing objects: 100% (78/78), done.
remote: Total 6099 (delta 30), reused 68 (delta 15), pack-reused 5998
Empfange Objekte: 100% (6099/6099), 117.43 MiB | 32.95 MiB/s, Fertig.
Löse Unterschiede auf: 100% (4092/4092), Fertig.
Submodul '3rd-party' (https://github.com/nesbox/3rd-party.git) für Pfad '3rd-party' in die Konfiguration eingetragen.
Klone nach '/home/madmike/git/TIC-80/3rd-party' ...
remote: Enumerating objects: 282, done.        
remote: Counting objects: 100% (282/282), done.        
remote: Compressing objects: 100% (257/257), done.        
remote: Total 7466 (delta 35), reused 264 (delta 25), pack-reused 7184        
Empfange Objekte: 100% (7466/7466), 51.61 MiB | 18.54 MiB/s, Fertig.
Löse Unterschiede auf: 100% (2804/2804), Fertig.
Submodul-Pfad: '3rd-party': '62c418b272da3104df4a04a5a280311892d62df5' ausgecheckt
Submodul 'duktape' (https://github.com/svaarala/duktape-releases.git) für Pfad '3rd-party/duktape' in die Konfiguration eingetragen.
Submodul 'sdl2' (https://github.com/SDL-mirror/SDL.git) für Pfad '3rd-party/sdl2' in die Konfiguration eingetragen.
Submodul 'sokol' (https://github.com/floooh/sokol.git) für Pfad '3rd-party/sokol' in die Konfiguration eingetragen.
Submodul 'squirrel' (https://github.com/albertodemichelis/squirrel.git) für Pfad '3rd-party/squirrel' in die Konfiguration eingetragen.
Submodul 'wren' (https://github.com/wren-lang/wren.git) für Pfad '3rd-party/wren' in die Konfiguration eingetragen.
Klone nach '/home/madmike/git/TIC-80/3rd-party/duktape' ...
remote: Enumerating objects: 3949, done.        
remote: Total 3949 (delta 0), reused 0 (delta 0), pack-reused 3949        
Empfange Objekte: 100% (3949/3949), 51.46 MiB | 27.12 MiB/s, Fertig.
Löse Unterschiede auf: 100% (2674/2674), Fertig.
Klone nach '/home/madmike/git/TIC-80/3rd-party/sdl2' ...
remote: Enumerating objects: 54, done.        
remote: Counting objects: 100% (54/54), done.        
remote: Compressing objects: 100% (32/32), done.        
remote: Total 112832 (delta 27), reused 37 (delta 21), pack-reused 112778        
Empfange Objekte: 100% (112832/112832), 125.90 MiB | 31.27 MiB/s, Fertig.
Löse Unterschiede auf: 100% (63977/63977), Fertig.
Klone nach '/home/madmike/git/TIC-80/3rd-party/sokol' ...
remote: Enumerating objects: 143, done.        
remote: Counting objects: 100% (143/143), done.        
remote: Compressing objects: 100% (90/90), done.        
remote: Total 2962 (delta 91), reused 101 (delta 53), pack-reused 2819        
Empfange Objekte: 100% (2962/2962), 2.12 MiB | 4.58 MiB/s, Fertig.
Löse Unterschiede auf: 100% (1976/1976), Fertig.
Klone nach '/home/madmike/git/TIC-80/3rd-party/squirrel' ...
remote: Enumerating objects: 45, done.        
remote: Counting objects: 100% (45/45), done.        
remote: Compressing objects: 100% (36/36), done.        
remote: Total 1429 (delta 20), reused 15 (delta 9), pack-reused 1384        
Empfange Objekte: 100% (1429/1429), 1019.73 KiB | 2.10 MiB/s, Fertig.
Löse Unterschiede auf: 100% (944/944), Fertig.
Klone nach '/home/madmike/git/TIC-80/3rd-party/wren' ...
remote: Enumerating objects: 37, done.        
remote: Counting objects: 100% (37/37), done.        
remote: Compressing objects: 100% (33/33), done.        
remote: Total 16198 (delta 9), reused 14 (delta 4), pack-reused 16161        
Empfange Objekte: 100% (16198/16198), 6.35 MiB | 8.74 MiB/s, Fertig.
Löse Unterschiede auf: 100% (10864/10864), Fertig.
Submodul-Pfad: '3rd-party/duktape': 'a4b0358f26bfb02a314db048e036f69c7250504f' ausgecheckt
Submodul-Pfad: '3rd-party/sdl2': 'c7b8b49ef8691ac85ad18298468f7e4a616290ed' ausgecheckt
Submodul-Pfad: '3rd-party/sokol': '487822d82ca79dba7b67718d962e1ba6beef01b2' ausgecheckt
Submodul-Pfad: '3rd-party/squirrel': '780e9c96b34d24d347c90756efa96f2927fcb641' ausgecheckt
Submodul-Pfad: '3rd-party/wren': 'd1a0d0682ac072fa20f2dcca356dac06565e93a1' ausgecheckt
madmike@desktop:~/git$ cd TIC-80/
madmike@desktop:~/git/TIC-80$ ls
3rd-party     bin    build_demos.sh  CODE_OF_CONDUCT.md  demos              docs      include  README.md  tools
appveyor.yml  build  CMakeLists.txt  config.tic          Dockerfile.dapper  examples  LICENSE  src
madmike@desktop:~/git/TIC-80$ cmake .
-- The C compiler identification is GNU 7.4.0
-- The CXX compiler identification is GNU 7.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Building for target : Linux
CMake Error at 3rd-party/sdl2/CMakeLists.txt:2 (message):
  Prevented in-tree built.  Please create a build directory outside of the
  SDL source code and call cmake from there


-- Configuring incomplete, errors occurred!
See also "/home/madmike/git/TIC-80/CMakeFiles/CMakeOutput.log".

CMakeOutput.log

[msx80]

I think those instructions are outdated, try the one on the main readme https://github.com/nesbox/TIC-80/blob/master/README.md

(basically it's just building from the "build" directory)

[nesbox]

yes, SDL2 requires you be in a subfolder to generate makefile
updated build instructions
thanks