Compile FAQ Q. I get error: security/pam_appl.h: File or directory doesn't exist What is wrong? A. You need to install pam development package. For Debian / Ubuntu this package is called libpam0g-dev. For Red Hat / Suse this package is called pam-devel. Q. I get error : A. You need to install opensll development package. For Debian / Ubuntu this package is called libssl-dev. For Red Hat / Suze this package is called openssl-devel. Q. A.i Red Hat libX11-devel libXfixes-devel Debian libx11-dev libxfixes-dev