Cannot compile/install gnu program on AIX

Hello,

I'm trying to install ansifilter which is a program that translates ansi text to HTML.
The idea is to install it on AIX 7.1 but is failing. All de appropriate gcc libraries and requirements for this software were installed successfully, but when I do the gmake I get the following error:

--------------------------------------------------------------------------
g++ arg_parser.o stringtools.o cmdlineoptions.o main.o platform_fs.o codegenerator.o htmlgenerator.o texgenerator.o latexgenerator.o rtfgenerator.o plaintextgenerator.o bbcodegenerator.o elementstyle.o stylecolour.o preformatter.o -o ansifilter
collect2: fatal error: crtcxa.o: cannot open as COFF file
compilation terminated.
gmake: *** [ansifilter] Error 1
--------------------------------------------------------------------------

Below is the content of the makefile:

####################################################
# Simple Makefile for ANSIFilter
# This file will compile the ansifilter binary.
# See INSTALL for instructions.

CC=g++

CFLAGS= -c -Wall -O2

LDFLAGS=

SOURCES=arg_parser.o stringtools.o cmdlineoptions.o main.o platform_fs.o\
codegenerator.o htmlgenerator.o texgenerator.o latexgenerator.o rtfgenerator.o\
plaintextgenerator.o bbcodegenerator.o elementstyle.o stylecolour.o preformatter.o

OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=ansifilter

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $@

.cpp.o:
$(CC) $(CFLAGS) $< -o $@

clean:
@rm -f .o
@rm -f ./ansifilter
@rm -f ./ansifilter_gui
@rm -f ./.deps/

####################################################

Any ideas?
Does this error means that AIX is lacking of something to open this COFF/XCOFF file?

Also please note that crtcxa.o does not exist on the source package of this program so I'm not sure from where it is coming from.

Thanks!