Snort Pre-processor + DPX Installation Issue

[waseem sarwar <waseemsarwar103 () hotmail com>]

Hi, 
I am new to snort development. 
I have planned to write my own pre-processor. Can you please help me with the following, 
1. Step by step guide to writing own pre-processor. 
2. I tried to build the dpx and followed the steps at 
http://www.snort.org/snort-downloads/dynamic-preprocessor-starter-kit/ but I am stuck with the following errors, 
waseem@waseem:~/dpx-1.4$ sudo ./build.sh
< Skimmed Output >
make[2]: Entering directory `/home/waseem/dpx-1.4/src'/bin/bash ../libtool --tag=CC   --mode=compile gcc 
-DHAVE_CONFIG_H -I. -I..   -I/home/waseem/snort-2.9.1/src/dynamic-examples/include  -g -O2 -DSF_VISIBILITY 
-fvisibility=hidden -fno-strict-aliasing -Wall -DDYNAMIC_PLUGIN -DZLIB -DGRE -DMPLS 
-DPREPROCESSOR_AND_DECODER_RULE_EVENTS -DPPM_MGR -DENABLE_MYSQL -DENABLE_PAF -DENABLE_REACT -DENABLE_RESPOND 
-DENABLE_RESPONSE3 -DSF_WCHAR -DSUP_IP6 -DTARGET_BASED -DPERF_PROFILING -DSNORT_RELOAD -DNORMALIZER -DACTIVE_RESPONSE 
-I/usr/local/include -I/usr/include/mysql   -fvisibility=hidden -c -o dpx.lo dpx.c../libtool: line 2076: dpx.c: command 
not foundlibtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -I/home/waseem/snort-2.9.1/src/dynamic-examples/include -g -O2 
-DSF_VISIBILITY -fvisibility=hidden -fno-strict-aliasing -Wall -DDYNAMIC_PLUGIN -DZLIB -DGRE -DMPLS 
-DPREPROCESSOR_AND_DECODER_RULE_EVENTS -DPPM_MGR -DENABLE_MYSQL -DENABLE_PAF -DENABLE_REACT -DENABLE_RESPOND 
-DENABLE_RESPONSE3 -DSF_WCHAR -DSUP_IP6 -DTARGET_BASED -DPERF_PROFILING -DSNORT_RELOAD -DNORMALIZER -DACTIVE_RESPONSE 
-I/usr/local/include -I/usr/include/mysql -fvisibility=hidden -c ""  -fPIC -DPIC -o .libs/dpx.ogcc: : No such file or 
directorygcc: no input filesmake[2]: *** [dpx.lo] Error 1make[2]: Leaving directory `/home/waseem/dpx-1.4/src'make[1]: 
*** [install] Error 2make[1]: Leaving directory `/home/waseem/dpx-1.4/src'make: *** [install-recursive] Error 
1waseem@waseem:~/dpx-1.4$
It is somehow unable to create the dpx.o. I have changed the access permissions to 777 of .libs/ and /src but it 
doesn't help. 
Kindly help me with this issue. 
Thanks,Waseem

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