Generate two versions of the same latex document

Makefile

.PHONY: all
all: tutorial.pdf tutorial-solns.pdf

%.pdf: %.tex
	pdflatex $^

%-solns.pdf: %.tex
	pdflatex -jobname $(basename $@) '\def\SOLUTIONS{} \input{$^}'

.PHONY: clean
clean:
	rm -f *.aux *.log *.pdf

tutorial.tex

\documentclass{article}

\ifdefined\SOLUTIONS
\newcommand{\solution}[1]{\textbf{Solution:} #1}
\else
\newcommand{\solution}[1]{}
\fi

\begin{document}
Job name: `\jobname'.\\

\solution{Just use makefiles!}

\end{document}