Can we remove the depency on systemfonts? - on linux

[FvD]

On linux there is a system-level dependency aparently caused by the systemfonts package. Can we remove that package from the depencies to avoid any system package installation?

* installing *source* package ‘systemfonts’ ...
** package ‘systemfonts’ successfully unpacked and MD5 sums checked
** using staged installation
Using PKG_CFLAGS=
Using PKG_LIBS=-lfontconfig -lfreetype
--------------------------- [ANTICONF] --------------------------------
Configuration failed to find the fontconfig freetype2 library. Try installing:
 * deb: libfontconfig1-dev (Debian, Ubuntu, etc)
 * rpm: fontconfig-devel (Fedora, EPEL)
 * csw: fontconfig_dev (Solaris)
 * brew: freetype (OSX)
If fontconfig freetype2 is already installed, check that 'pkg-config' is in your
PATH and PKG_CONFIG_PATH contains a fontconfig freetype2.pc file. If pkg-config
is unavailable you can set INCLUDE_DIR and LIB_DIR manually via:
R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'
-------------------------- [ERROR MESSAGE] ---------------------------
<stdin>:1:10: fatal error: fontconfig/fontconfig.h: No such file or directory
compilation terminated.

[danielgranadoscampos]

Systemfonts, freetype2 and tinytext (mentioned in #87 and #54 ) seem to be involved with knitr and documentation. However , renv::dependencies doesn't list them