+ ruby extconf.rb
checking for main() in -lz... yes
checking for main() in -lpng... no
checking for main() in -lfreetype... no
checking for main() in -lart_lgpl_2... no
checking for rrd_first() in -lrrd... yes
creating Makefile
+ make
gcc -I. -I. -I/usr/lib64/ruby/1.8/x86_64-linux -I.  -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall -fno-strict-aliasing  -fPIC -DHAVE_RRD_DUMP_R_2  -c rubyrrdtool.c
rubyrrdtool.c: In function 'rrdtool_create':
rubyrrdtool.c:317: warning: passing argument 5 of 'rrd_create_r' from incompatible pointer type
rubyrrdtool.c: In function 'rrdtool_update':
rubyrrdtool.c:590: warning: passing argument 4 of 'rrd_update_r' from incompatible pointer type
gcc -shared  -L"/usr/lib64" -o RRDtool.so rubyrrdtool.o  -lruby -lrrd -lz  -lpthread -ldl -lcrypt -lm   -lc
+ exit 0