Docs error: make: *** No rule to make target help-message.txt', needed by html'

[barracuda156]

Docs seem to be broken due to missing target/file:

make: *** No rule to make target `help-message.txt', needed by `html'.  Stop.

[xpfy]

I have defined a UDF for Fraser-Suzuki like this : define Myfs(height, center, hwhm, shape) = heightexp(-ln(2)(ln(1+2shape(x-center)/hwhm))^2/shape^2), but I found that there had some "NAN", I tried to use the "TERNARY" to solve this problem like this: define Myfs(height, center, hwhm, shape)=2shape(x-center)/hwhm<1? (heightexp(-ln(2)(ln(1+2shape(x-center)/hwhm)/shape)^2)):0, but the had some error message: "`AFTER_TERNARY' is not allowed for variables/functions"