I try to install xdebug on MacOs Mojave but get this error
/private/tmp/pear/install/xdebug/xdebug.c:25:10: fatal error: 'php.h' file not found
Command Line Tools are installed.
I ran into this trying to compile xdebug on my system, I had to do the following to get it to work
0) Check that you have the file /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg on your system.
1) If not, install the command line tools (I had installed them at one point, but the files under /Library/Developer/CommandLineTools/ were missing so I must have deleted it...)
xcode-select --install
2) Reinstall the header files
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
Credit to @donatJ - https://stackoverflow.com/a/52612102/649915