1al_is_system_installed(3)  Library Functions Manual  al_is_system_installed(3)
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NAME

6       al_is_system_installed
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              bool al_is_system_installed(void)
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DESCRIPTION

14       Returns true if Allegro is initialized, otherwise returns false.
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18Allegro reference manual                             al_is_system_installed(3)