Build system does not respect -DCMAKE_INSTALL_INCLUDEDIR in `make install` command

[RobertAlbus]

Describe the bug When installing PortAudio with make install the header is placed at /include/portaudio.h instead of CMAKE_INSTALL_PREFIX/CMAKE_INSTALL_INCLUDEDIR/portaudio.h

To Reproduce Steps to reproduce the behavior. Include code if applicable.

1. CMake generation

   $ mkdir build && ch build
   $ cmake -DCMAKE_INSTALL_PREFIX=/dependencies -DCMAKE_INSTALL_INCLUDEDIR=include/portaudio ..

2. Build and install

   $ make build
   $ make install

3. Examine installation directory

   $ ls /dependencies
   dependencies/include/portaudio.h
   # configured directory was /dependencies/include/portaudio/portaudio.h

Expected behavior The header should be installed at the configured location:

• CMAKE_INSTALL_PREFIX/CMAKE_INSTALL_INCLUDEDIR/portaudio.h
• /dependencies/include/portaudio/portaudio.h

Actual behavior Regardless of configuration, the header is installed at:

• /dependencies/include/portaudio.h

Desktop (please complete the following information):

• OS: Manjaro Linux
• OS Version [e.g. 22]
• PortAudio version: git tag "v19.7.0"
• If Windows or Linux, which Host API (e.g. WASAPI): N/A, this is a build system issue

Additional context This works with most other libraries that define an install target.

[RobertAlbus]

Closing this issue because it is is solved on master with the following CMake arguments:

cmake -DCMAKE_INSTALL_PREFIX=$INSTALL_DIR \
        -DCMAKE_INSTALL_INCLUDEDIR=include/portaudio \
        -DCMAKE_FRAMEWORK=FALSE \
        ..