[root@cb-ol10 ~]# set -x

cat /etc/oracle-release 2>/dev/null || cat /etc/redhat-release 2>/dev/null

rrdtool --version 2>/dev/null || true
pkg-config --modversion librrd 2>/dev/null || echo "no pkg-config/librrd.pc"
pkg-config --cflags librrd 2>/dev/null || true
pkg-config --libs librrd 2>/dev/null || true

ls -l /usr/include/rrd.h /usr/local/include/rrd.h 2>/dev/null || true
readlink -f /usr/include/rrd.h /usr/local/include/rrd.h 2>/dev/null || true

grep -n 'rrd_graph' /usr/include/rrd.h 2>/dev/null | head -n 5 || true
sed -n '170,200p' /usr/include/rrd.h 2>/dev/null || true

echo | cc -E -v -xc - 2>&1 | sed -n '/#include <...> search starts here:/,/End of search list./p'
cc -H -E -xc /dev/null $(pkg-config --cflags librrd 2>/dev/null) 2>&1 | grep -E 'rrd\.h|include' || true

ldconfig -p 2>/dev/null | grep -i librrd || true

set +x
+ cat /etc/oracle-release
Oracle Linux Server release 10.1
+ rrdtool --version
RRDtool 1.8.0  Copyright by Tobias Oetiker <tobi@oetiker.ch>
               Compiled Oct 29 2024 00:00:00

Usage: rrdtool [options] command command_options
Valid commands: create, update, updatev, graph, graphv,  dump, restore,
                last, lastupdate, first, info, list, fetch, tune,
                resize, xport, flushcached

RRDtool is distributed under the Terms of the GNU General
Public License Version 2. (www.gnu.org/copyleft/gpl.html)

For more information read the RRD manpages

+ pkg-config --modversion librrd
1.8.0
+ pkg-config --cflags librrd

+ pkg-config --libs librrd
-lrrd
+ ls --color=auto -l /usr/include/rrd.h /usr/local/include/rrd.h
-rw-r--r-- 1 root root 13525 Oct 29  2024 /usr/include/rrd.h
+ true
+ readlink -f /usr/include/rrd.h /usr/local/include/rrd.h
/usr/include/rrd.h
/usr/local/include/rrd.h
+ head -n 5
+ grep --color=auto -n rrd_graph /usr/include/rrd.h
12: * let rrd_graph return the actual value range it picked ...
19: * allow to pass an open filehandle into rrd_graph as an extra argument
183:    int       rrd_graph(
192:    rrd_info_t *rrd_graph_v(
+ sed -n 170,200p /usr/include/rrd.h
    rrd_info_t *);
    char     *rrd_list(
    int,
    const char **);
    char     *rrd_list_r(
    int,
    const char *dirname);
    int       rrd_update(
    int,
    const char **);
    rrd_info_t *rrd_update_v(
    int,
    const char **);
    int       rrd_graph(
    int,
    const char **,
    char ***,
    int *,
    int *,
    FILE *,
    double *,
    double *);
    rrd_info_t *rrd_graph_v(
    int,
    const char **);

    int       rrd_fetch(
    int,
    const char **,
    time_t *,
    time_t *,
+ cc -E -v -xc -
+ sed -n '/#include <...> search starts here:/,/End of search list./p'
+ echo
#include <...> search starts here:
 /usr/lib/gcc/x86_64-redhat-linux/14/include
 /usr/local/include
 /usr/include
End of search list.
+ grep --color=auto -E 'rrd\.h|include'
++ pkg-config --cflags librrd
+ cc -H -E -xc /dev/null
# 1 "/usr/include/stdc-predef.h" 1 3 4
+ grep --color=auto -i librrd
+ ldconfig -p
        librrd.so.8 (libc6,x86-64) => /lib64/librrd.so.8
        librrd.so (libc6,x86-64) => /lib64/librrd.so
+ set +x
[root@cb-ol10 ~]#