How to patch a package

Question

I have a document that uses symbols both from the marvosym package as well as the eurosym package. There are two commands that clash and I get an error message (due to \newcommand being used and leading to the error Command \EUR already defined.).

What is the appropriate way to patch a package? What I have done - in the meantime - was to modify the marvosym.sty file and to place it in the document directory.

Answer 1

To just avoid the error, you could declare the affected macro to be undefined:

\usepackage{eurosym}
\let\EUR\undefined
\usepackage{marvosym}

If you would like to use symbols of both package with originally equal name, you could use the savesym package.

\usepackage{savesym}
\usepackage{eurosym}
\savesymbol{EUR}
\usepackage{marvosym}
\restoresymbol{marvosym}{EUR}
...
\EUR\ vs. \marvosymEUR