bash-4.3$ echo "uses Crt;begin write('Press any key to continue...');readkey;end." > ismael.pas

bash-4.3$ fpc ismael.pas
Free Pascal Compiler version 3.0.0+dfsg-8 [2016/09/03] for x86_64
Copyright (c) 1993-2015 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling ismael.pas
Linking ismael
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
1 lines compiled, 2.1 sec

bash-4.3$ ./ismael
Press any key to continue...