Then I'm sorry, but still a no-go:
athlon2500:/home/hans/arcangel-0.0.1# make
gcc -std=c99 -O4 -c arc.c `pkg-config jack --cflags`
-I/usr/X11R6/include/X11/
gcc -std=c99 -O4 -c form.c
form.c:3:19: error: forms.h: No such file or directory
In file included from form.c:5:
form.h:7: error: syntax error before '*' token
form.h:8: error: syntax error before '*' token
form.h:13: error: syntax error before 'FL_FORM'
form.h:13: warning: no semicolon at end of struct or union
form.h:17: error: syntax error before '*' token
form.h:17: warning: type defaults to 'int' in declaration of 'quit'
form.h:17: warning: data definition has no type or storage class
form.h:18: error: syntax error before '*' token
form.h:18: warning: type defaults to 'int' in declaration of 'dial'
form.h:18: warning: data definition has no type or storage class
form.h:19: error: syntax error before '}' token
form.h:19: warning: type defaults to 'int' in declaration of
'FD_arcangel'
form.h:19: warning: data definition has no type or storage class
form.h:21: error: syntax error before '*' token
form.h:21: warning: type defaults to 'int' in declaration of
'create_form_arcangel'
form.h:21: warning: data definition has no type or storage class
form.c:7: error: syntax error before '*' token
form.c:8: warning: return type defaults to 'int'
form.c: In function 'create_form_arcangel':
form.c:9: error: 'FL_OBJECT' undeclared (first use in this function)
form.c:9: error: (Each undeclared identifier is reported only once
form.c:9: error: for each function it appears in.)
form.c:9: error: 'obj' undeclared (first use in this function)
form.c:10: error: 'fdui' undeclared (first use in this function)
form.c:10: error: syntax error before ')' token
form.c:12: warning: implicit declaration of function 'fl_bgn_form'
form.c:12: error: 'FL_NO_BOX' undeclared (first use in this function)
form.c:13: warning: implicit declaration of function 'fl_add_box'
form.c:13: error: 'FL_FRAME_BOX' undeclared (first use in this function)
form.c:14: warning: implicit declaration of function 'fl_set_object_color'
form.c:14: error: 'FL_WHITE' undeclared (first use in this function)
form.c:14: error: 'FL_COL1' undeclared (first use in this function)
form.c:15: warning: implicit declaration of function 'fl_add_button'
form.c:15: error: 'FL_NORMAL_BUTTON' undeclared (first use in this function)
form.c:16: warning: implicit declaration of function
'fl_set_button_shortcut'
form.c:17: warning: implicit declaration of function 'fl_set_object_boxtype'
form.c:17: error: 'FL_BORDER_BOX' undeclared (first use in this function)
form.c:19: warning: implicit declaration of function 'fl_set_object_gravity'
form.c:19: error: 'FL_SouthEast' undeclared (first use in this function)
form.c:20: warning: implicit declaration of function
'fl_set_object_callback'
form.c:21: warning: implicit declaration of function 'fl_add_dial'
form.c:21: error: 'FL_FILL_DIAL' undeclared (first use in this function)
form.c:22: error: 'FL_DODGERBLUE' undeclared (first use in this function)
form.c:25: warning: implicit declaration of function 'fl_set_dial_bounds'
form.c:26: warning: implicit declaration of function 'fl_set_dial_value'
form.c:27: warning: implicit declaration of function 'fl_set_dial_step'
form.c:28: warning: implicit declaration of function 'fl_set_dial_return'
form.c:28: error: 'FL_RETURN_ALWAYS' undeclared (first use in this function)
form.c:29: warning: implicit declaration of function 'fl_end_form'
make: *** [form.o] Error 1