Making all in src
make[2]: Entering directory `/home/mjktfw/Desktop/mfold_util-4.6/src'
gcc  -O3 -Wall -m32  -L/usr/X11R6/lib -L/usr/local/lib -L/usr/lib -o boxplot_ng boxplot_ng.o  -lpng -ljpeg -lgd
/usr/bin/ld: boxplot_ng.o: undefined reference to symbol 'sqrt@@GLIBC_2.0'
/usr/bin/ld: note: 'sqrt@@GLIBC_2.0' is defined in DSO /lib/i386-linux-gnu/libm.so.6 so try adding it to the linker command line
/lib/i386-linux-gnu/libm.so.6: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[2]: *** [boxplot_ng] Error 1
make[2]: Leaving directory `/home/mjktfw/Desktop/mfold_util-4.6/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/mjktfw/Desktop/mfold_util-4.6'
make: *** [all] Error 2