fix compilation under Linux - ploot - simple plotting tools
 (HTM) git clone git://bitreich.org/ploot git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/ploot
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       ---
 (DIR) commit fe139dc6e7dddb2211caedff45f9ba2a0ec47723
 (DIR) parent f24b386089412df1f2d658ecefd3471f3bddfda3
 (HTM) Author: Josuah Demangeon <mail@josuah.net>
       Date:   Wed,  7 Feb 2018 00:47:33 +0100
       
       fix compilation under Linux
       
       Diffstat:
         M Makefile                            |       2 +-
         M ploot.c                             |       4 ++--
       
       2 files changed, 3 insertions(+), 3 deletions(-)
       ---
 (DIR) diff --git a/Makefile b/Makefile
       @@ -1,4 +1,4 @@
       -CFLAGS        = -Wall -Wextra -Werror -std=c89 -pedantic
       +CFLAGS        = -Wall -Wextra -Werror -std=c89 -pedantic -D_POSIX_C_SOURCE=200809L
        
        all:ploot
        
 (DIR) diff --git a/ploot.c b/ploot.c
       @@ -56,7 +56,7 @@ humanize(char *str, double val)
                precision = (ABS(val) < 10) ? (3) : (ABS(val) < 100) ? (2) : (1);
                if (exp == 0)
                        precision++;
       -        snprintf(str, 8, "%+.*f%c", precision, val, label[exp]);
       +        sprintf(str, "%+.*f%c", precision, val, label[exp]);
                if (val >= 0)
                        str[0] = ' ';
        }
       @@ -254,7 +254,7 @@ main(int argc, char **argv)
        {
                time_t        tbuf[MAX_VAL], *tend;
                double        vbuf[MAX_VAL], *vend;
       -        char        c;
       +        int        c;
        
                while ((c = getopt(argc, argv, "h:t:o:")) != -1) {
                        switch (c) {