Does not build with gcc 4.8.5 (easy fix)

[aseigo]

When compiling on CentOS 7 the follow error occurs:

src/ex_ncurses.c: In function ‘ex_invoke’:
src/ex_ncurses.c:715:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (size_t i = 0; i < sizeof(invoke_funcs) / sizeof(ErlNifFunc); i++) {
     ^
src/ex_ncurses.c:715:5: note: use option -std=c99 or -std=gnu99 to compile your code

changing this line in the Makefile:

CFLAGS ?= -fPIC -O2 -Wall -Wextra -Wno-unused-parameter

to

CFLAGS ?= -std=c99 -fPIC -O2 -Wall -Wextra -Wno-unused-parameter

resolves the issue

[fhunleth]

@aseigo Would you mind sending a pull request with this change?

[aseigo]

actually, it is "fixed" in master as it no longer does a declaration in the for loop. so what appears to be needed is a new release ...