已经提示得很清楚了：
Read R for Mac OS X FAQ (see Help) section 9 and adjust your system preferences accordingly.

在stackoverflow上一搜就有了，如图

请问我在哪看这个Mac OS X FAQ section 9呢？

谢谢！这个问题解决了，但是下面那个包我还是装不上，提示下面的东西
library(gEcon)
Loading required package: MASS
Loading required package: Matrix
Loading required package: nleqslv
Loading required package: Rcpp
Error: package or namespace load failed for ‘gEcon’:
package ‘gEcon’ was installed by an R version with different internals; it needs to be reinstalled for use with this R version

大佬们，第二个图已经解决了，请问第一个图是怎么回事呢