Works for me just fine if I
1. open a fresh Geany (1.29) 2. replace "xterm" to "xfce4-terminal" in the Preferences/Tools (giving me `xfce4-terminal -e "/bin/sh %c"`) 3. paste the sample C program into the buffer 4. save it as */tmp/1369.c* 5. click on the "Build" icon (<kbd>F9</kbd>) 6. click on the Execute icon (<kbd>F5</kbd>)
after install, click on button < Build >, compiler wrote: make: *** No targets specified and no makefile found. Stop.
This is odd, *Build* shouldn't be running `make` by default
and Execute button: "./%e" wont work, with xfce4-terminal.
Does the file actually exist? Should be the name of your source file minus the extension, next to the source file.