I cant build it

[jonshouse1]

I struggle with build tools but I am at least following the instructions.

I have a Pico VGA demo board and have built and run the example code so I know at least some of the build environment is ok.

Trying to build b-em.

I have these bash environment variables set, not sure if cmake will pick them up or not.
PICO_SDK_PATH, PICO_EXAMPLES_PATH, PICO_EXTRAS_PATH, PICO_PLAYGROUND_PATH

mkdir pico_build
cd pico_build
cmake with many goes at args

Gives me ...

Building b-em via regular build
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  Could NOT find Allegro (missing: ALLEGRO_LIBRARY ALLEGRO_FONT_LIBRARY
  ALLEGRO_IMAGE_LIBRARY ALLEGRO_TTF_LIBRARY ALLEGRO_PRIMITIVES_LIBRARY
  ALLEGRO_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindAllegro.cmake:83 (find_package_handle_standard_args)
  CMakeLists.txt:48 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/jon/b-em/pico_build/CMakeFiles/CMakeOutput.log".

Anyone any ideas? thanks.

[ctw2100]

missing Allegro library, try this: brew install Allegro

[ArnoldUK]

The problem is the main CMakeLists.txt file not finding or setting PICO_ON_DEVICE correctly and defaults to a regular build. Allegro isn't used for a pico build.
Open the CMakeLists.txt and add the following to lines at the top of the file:
cmake_minimum_required(VERSION 3.13)
set(PICO_BUILD 1)
set(PICO_ON_DEVICE 1)
You can also set these defines in the cmake build command line:
cmake -DPICO_BUILD=1 -DPICO_ON_DEVICE=1 -DPICO_BOARD=vgaboard ..