C linking fails

[James Rome]

I am using gcc and ggdb from MacPorts, and Apple's make to try and
develop C programs in Yosemite using NetBeans.

But I keep getting the following when I build:
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.4.0
Thread model: posix
 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
-cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj -mrelax-all
-disable-free -disable-llvm-verifier -main-file-name zcursor.c
-mrelocation-model pic -pic-level 2 -mdisable-fp-elim -masm-verbose
-munwind-tables -target-cpu core2 -target-linker-version 242.2 -v
-gdwarf-2 -dwarf-column-info -coverage-file
/Volumes/MacHD3/PASSUR/TimeStamps/build/Debug/GNU-MacOSX/src/zcursor.o
-resource-dir
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.1.0
-dependency-file build/Debug/GNU-MacOSX/src/zcursor.o.d -MT
build/Debug/GNU-MacOSX/src/zcursor.o -MP -I /Users/jar/GraphiC2/include
-I /opt/local/include -I
/opt/local/lib/gcc49/gcc/x86_64-apple-darwin14/4.9.2/include -I
/opt/local/lib/gcc49/gcc/x86_64-apple-darwin14/4.9.2/include-fixed -O0
-fdebug-compilation-dir /Volumes/MacHD3/PASSUR/TimeStamps -ferror-limit
19 -fmessage-length 0 -stack-protector 1 -mstackrealign -fblocks
-fobjc-runtime=macosx-10.10.0 -fencode-extended-block-signature
-fmax-type-align=16 -fdiagnostics-show-option -o
build/Debug/GNU-MacOSX/src/zcursor.o -x c src/zcursor.c
clang -cc1 version 6.1.0 based upon LLVM 3.6.0svn default target
x86_64-apple-darwin14.4.0
ignoring nonexistent directory
"/opt/local/lib/gcc49/gcc/x86_64-apple-darwin14/4.9.2/include"
ignoring nonexistent directory
"/opt/local/lib/gcc49/gcc/x86_64-apple-darwin14/4.9.2/include-fixed"
#include "..." search starts here:
#include <...> search starts here:
 /Users/jar/GraphiC2/include
 /opt/local/include
 /usr/local/include
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.1.0/include
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
mkdir -p dist/Debug/GNU-MacOSX
ld -o dist/Debug/GNU-MacOSX/timestamps build/Debug/GNU-MacOSX/main.o
build/Debug/GNU-MacOSX/src/arrow.o build/Debug/GNU-MacOSX/src/axesdraw.o
build/Debug/GNU-MacOSX/src/barplt.o build/Debug/GNU-MacOSX/src/baux.o
build/Debug/GNU-MacOSX/src/bothplt.o
build/Debug/GNU-MacOSX/src/boxfill.o build/Debug/GNU-MacOSX/src/bplt.o
build/Debug/GNU-MacOSX/src/circles.o build/Debug/GNU-MacOSX/src/cntaux.o
build/Debug/GNU-MacOSX/src/cntplt.o build/Debug/GNU-MacOSX/src/color.o
build/Debug/GNU-MacOSX/src/colorkey.o
build/Debug/GNU-MacOSX/src/conmatr.o build/Debug/GNU-MacOSX/src/cursor.o
build/Debug/GNU-MacOSX/src/curves.o build/Debug/GNU-MacOSX/src/d3aux.o
build/Debug/GNU-MacOSX/src/d3plt.o build/Debug/GNU-MacOSX/src/d4plt.o
build/Debug/GNU-MacOSX/src/erfplt.o build/Debug/GNU-MacOSX/src/getxy.o
build/Debug/GNU-MacOSX/src/gridopts.o
build/Debug/GNU-MacOSX/src/insert.o build/Debug/GNU-MacOSX/src/labset.o
build/Debug/GNU-MacOSX/src/legend.o
build/Debug/GNU-MacOSX/src/lineattr.o build/Debug/GNU-MacOSX/src/lines.o
build/Debug/GNU-MacOSX/src/linplt.o build/Debug/GNU-MacOSX/src/logplt.o
build/Debug/GNU-MacOSX/src/lplt.o build/Debug/GNU-MacOSX/src/matsolve.o
build/Debug/GNU-MacOSX/src/memory.o
build/Debug/GNU-MacOSX/src/messages.o
build/Debug/GNU-MacOSX/src/panfil.o
build/Debug/GNU-MacOSX/src/patchplt.o build/Debug/GNU-MacOSX/src/pclp.o
build/Debug/GNU-MacOSX/src/pieplt.o
build/Debug/GNU-MacOSX/src/plumeplt.o
build/Debug/GNU-MacOSX/src/polplt.o
build/Debug/GNU-MacOSX/src/position.o
build/Debug/GNU-MacOSX/src/psfont.o build/Debug/GNU-MacOSX/src/r3plt.o
build/Debug/GNU-MacOSX/src/rfit.o build/Debug/GNU-MacOSX/src/roundoff.o
build/Debug/GNU-MacOSX/src/simplt.o build/Debug/GNU-MacOSX/src/smear.o
build/Debug/GNU-MacOSX/src/smith.o build/Debug/GNU-MacOSX/src/smooth.o
build/Debug/GNU-MacOSX/src/statfuns.o
build/Debug/GNU-MacOSX/src/surmatr.o build/Debug/GNU-MacOSX/src/svc.o
build/Debug/GNU-MacOSX/src/symbols.o build/Debug/GNU-MacOSX/src/tekint.o
build/Debug/GNU-MacOSX/src/tkfPush.o build/Debug/GNU-MacOSX/src/tplt.o
build/Debug/GNU-MacOSX/src/triangle.o
build/Debug/GNU-MacOSX/src/truetype.o
build/Debug/GNU-MacOSX/src/ttdisk.o build/Debug/GNU-MacOSX/src/ttfntld.o
build/Debug/GNU-MacOSX/src/ttfntplt.o
build/Debug/GNU-MacOSX/src/zcursor.o  -v
@(#)PROGRAM:ld  PROJECT:ld64-242.2
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64
x86_64h armv6m armv7m armv7em
Library search paths:
    /usr/lib
    /usr/local/lib
Framework search paths:
    /Library/Frameworks/
    /System/Library/Frameworks/
ld: warning: -macosx_version_min not specified, assuming 10.10
Undefined symbols for architecture x86_64:
  "_RingBuffer_create", referenced from:
      _main in main.o
  "___memcpy_chk", referenced from:

. . . .

  "start", referenced from:
     implicit entry/start for main executable
     (maybe you meant: _startq, _get_start_endq , _startplot , _line_start )
ld: symbol(s) not found for inferred architecture x86_64
make[2]: *** [dist/Debug/GNU-MacOSX/timestamps] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2

How do I overcome this?

Thanks,
Jim

-- 
James A. Rome
http://jamesrome.net