Merge remote-tracking branch 'upstream/master'

gt-workbench.md

@@ -151,7 +151,7 @@ In our lab, compiling ``graph-tool`` counts as work.
 ![](https://imgs.xkcd.com/comics/compiling.png)
 :::
 ```bash
-./configure CXX="ccache g++" MOD_CXXFLAGS="-flto" LDFLAGS="-flto"
+./configure --prefix=/usr CXX="ccache g++" MOD_CXXFLAGS="-flto" LDFLAGS="-flto"
 ```
 
 We can now actually start the compilation by evoking ``make``: