Compilation fails with the following error message:
launcher-exec.c: In function 'launcher_exec_on_screen':
launcher-exec.c:456: error: 'environ' undeclared (first use in this function)
launcher-exec.c:456: error: (Each undeclared identifier is reported only once
launcher-exec.c:456: error: for each function it appears in.)

Glibc defines the variable 'environ' within an ifdef statement in unistd.h as shown below:

#ifdef __USE_GNU
extern char **environ;
#endif