Lot of errors when trying to install R package igraph

Question

I'm trying to install R package "igraph" in Linux server and stuck with some errors.

I've tried install.packages("igraph"), and got these error messages :

Problem related with checking whether the C compiler works... no :

* installing *source* package ‘igraph’ ...
** package ‘igraph’ successfully unpacked and MD5 sums checked
checking for gcc... /usr/local/bin/gcc
checking whether the C compiler works... no
configure: error: in `/tmp/RtmpPaaksz/R.INSTALL8c157a39a973/igraph':
configure: error: C compiler cannot create executables
See `config.log' for more details
ERROR: configuration failed for package ‘igraph’

Problem related with lazyeval.c:53: error: ‘for’ loop initial declarations are only allowed in C99 mode :

lazyeval.c: In function ‘make_lazy_dots’:
lazyeval.c:53: error: ‘for’ loop initial declarations are only allowed in C99 mode
lazyeval.c:53: note: use option -std=c99 or -std=gnu99 to compile your code
lazyeval.c:63: error: redefinition of ‘nxt’
lazyeval.c:53: note: previous definition of ‘nxt’ was here
make: *** [lazyeval.o] Error 1
ERROR: compilation failed for package ‘igraph’

Answer 1

change your ~/.R/Makevars file as

C=gcc-5
CXX=g++
CXX1X = g++-5
CFLAGS = -std=c99 -Wall -pedantic