Newbie Automake Problem

[JASON TILLEY]

I am trying to create a Makefile.am for a package on github in order to make it 
more friendly to packaging (https://github.com/sakov/csa-c). I am having 
linking problems on my Mac. I’m sure its my complete lack of understanding of 
Automake. My make command executes the following:

depbase=`echo src/csa.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
        /bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. 
-I./src     -g -O2 -MT src/csa.lo -MD -MP -MF $depbase.Tpo -c -o src/csa.lo 
src/csa.c &&\
        mv -f $depbase.Tpo $depbase.Plo
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/csa.lo -MD 
-MP -MF src/.deps/csa.Tpo -c src/csa.c  -fno-common -DPIC -o src/.libs/csa.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/csa.lo -MD 
-MP -MF src/.deps/csa.Tpo -c src/csa.c -o src/csa.o >/dev/null 2>&1
depbase=`echo src/svd.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
        /bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. 
-I./src     -g -O2 -MT src/svd.lo -MD -MP -MF $depbase.Tpo -c -o src/svd.lo 
src/svd.c &&\
        mv -f $depbase.Tpo $depbase.Plo
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/svd.lo -MD 
-MP -MF src/.deps/svd.Tpo -c src/svd.c  -fno-common -DPIC -o src/.libs/svd.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/svd.lo -MD 
-MP -MF src/.deps/svd.Tpo -c src/svd.c -o src/svd.o >/dev/null 2>&1
depbase=`echo src/minell.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
        /bin/sh ./libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. 
-I./src     -g -O2 -MT src/minell.lo -MD -MP -MF $depbase.Tpo -c -o 
src/minell.lo src/minell.c &&\
        mv -f $depbase.Tpo $depbase.Plo
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/minell.lo -MD 
-MP -MF src/.deps/minell.Tpo -c src/minell.c  -fno-common -DPIC -o 
src/.libs/minell.o
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I./src -g -O2 -MT src/minell.lo -MD 
-MP -MF src/.deps/minell.Tpo -c src/minell.c -o src/minell.o >/dev/null 2>&1
/bin/sh ./libtool  --tag=CC   --mode=link gcc  -g -O2   -o libcsa.la -rpath 
/usr/local/lib src/csa.lo src/svd.lo src/minell.lo  
libtool: link: gcc -dynamiclib -Wl,-undefined -Wl,dynamic_lookup -o 
.libs/libcsa.0.dylib  src/.libs/csa.o src/.libs/svd.o src/.libs/minell.o    -g 
-O2   -install_name  /usr/local/lib/libcsa.0.dylib -compatibility_version 1 
-current_version 1.0 -Wl,-single_module
libtool: link: (cd ".libs" && rm -f "libcsa.dylib" && ln -s "libcsa.0.dylib" 
"libcsa.dylib")
libtool: link: ar cru .libs/libcsa.a  src/csa.o src/svd.o src/minell.o
libtool: link: ranlib .libs/libcsa.a
libtool: link: ( cd ".libs" && rm -f "libcsa.la" && ln -s "../libcsa.la" 
"libcsa.la" )
gcc -DHAVE_CONFIG_H -I. -I./src     -g -O2 -MT src/csabathy-csa.o -MD -MP -MF 
src/.deps/csabathy-csa.Tpo -c -o src/csabathy-csa.o `test -f 'src/csa.c' || 
echo './'`src/csa.c
mv -f src/.deps/csabathy-csa.Tpo src/.deps/csabathy-csa.Po
gcc -DHAVE_CONFIG_H -I. -I./src     -g -O2 -MT src/csabathy-svd.o -MD -MP -MF 
src/.deps/csabathy-svd.Tpo -c -o src/csabathy-svd.o `test -f 'src/svd.c' || 
echo './'`src/svd.c
mv -f src/.deps/csabathy-svd.Tpo src/.deps/csabathy-svd.Po
gcc -DHAVE_CONFIG_H -I. -I./src     -g -O2 -MT src/csabathy-minell.o -MD -MP 
-MF src/.deps/csabathy-minell.Tpo -c -o src/csabathy-minell.o `test -f 
'src/minell.c' || echo './'`src/minell.c
mv -f src/.deps/csabathy-minell.Tpo src/.deps/csabathy-minell.Po
/bin/sh ./libtool  --tag=CC   --mode=link gcc  -g -O2 '-lm -lcsa'  -o csabathy 
src/csabathy-csa.o src/csabathy-svd.o src/csabathy-minell.o libcsa.la 
libtool: link: gcc -g -O2 -o .libs/csabathy src/csabathy-csa.o 
src/csabathy-svd.o src/csabathy-minell.o  -lm 
/Users/username/Downloads/csa-c-master/.libs/libcsa.dylib ./.libs/libcsa.dylib
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make: *** [csabathy] Error 1

Does anyone know what this error means? Thanks.