/usr/share/doc/nasm/examples/ifenv.asm is in nasm 2.11.05-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | %macro import 1
%defstr %%incfile %!PROJECTBASEDIR/%{1}.inc
%defstr %%decfile %!'PROJECTBASEDIR'/%{1}.dec
db %%incfile, `\n`
db %%decfile, `\n`
%endmacro
%ifenv PROJECTBASEDIR
import foo
%else
%warning No PROJECTBASEDIR defined
%endif
%ifenv %!PROJECTBASEDIR
import foo
%else
%warning No PROJECTBASEDIR defined
%endif
%ifenv 'PROJECTBASEDIR'
import foo
%else
%warning No PROJECTBASEDIR defined
%endif
%ifenv %!'PROJECTBASEDIR'
import foo
%else
%warning No PROJECTBASEDIR defined
%endif
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