Add -lm to 2018/bellard/Makefile

Not all systems implicitly link in libm so this is necessary for those
systems.

2018/bellard/Makefile

@@ -75,7 +75,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 
 # Libraries needed to build
 #
-LIBS= -lcurses
+LIBS= -lcurses -lm
 
 # C compiler to use
 #

thanks-for-fixes.md

@@ -1314,6 +1314,11 @@ files from compiling properly, trying instead to compile already compiled code.
 He also added explicit linking of libm (`-lm`) for systems that do not do this
 (linux seems to not but macOS does).
 
+## [2018/bellard](2018/bellard/prog.c) ([README.md](2018/bellard/README.md))
+
+Cody added explicit linking of libm (`-lm`) for systems that do not do this
+(linux doesn't seem to but macOS does).
+
 
 ## [2019/ciura](2019/ciura/prog.c) ([README.md](2019/ciura/README.md]))