svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/
svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data/branches/pd-extended/0.42/pd
svn co https://pd-gem.svn.sourceforge.net/svnroot/pd-gem/branches/0.92/Gem

i'm here:

gcc -DPD -Wall -W -Wstrict-prototypes -Wno-unused -Wno-parentheses -Wno-switch -fPIC -O2 -funroll-loops -fomit-frame-pointer -ffast-math   -DPDP_VERSION=\"0.12.5-darcs\" -I. -I/usr/X11R6/include  -I../include -I../../include -I/home/muranyia/Download/pure-data/pd/src   -o pdp_reg.o -c pdp_reg.c
In file included from ../../include/pdp.h:80,
                 from pdp_reg.c:23:
../../include/pdp_matrix.h:25:27: error: gsl/gsl_block.h: No such file or directory
../../include/pdp_matrix.h:26:28: error: gsl/gsl_vector.h: No such file or directory
../../include/pdp_matrix.h:27:28: error: gsl/gsl_matrix.h: No such file or directory
../../include/pdp_matrix.h:28:26: error: gsl/gsl_blas.h: No such file or directory
../../include/pdp_matrix.h:29:29: error: gsl/gsl_linalg.h: No such file or directory
In file included from ../../include/pdp.h:80,
                 from pdp_reg.c:23:
../../include/pdp_matrix.h:44: error: expected specifier-qualifier-list before ‘gsl_block’
../../include/pdp_matrix.h:65: error: expected ‘)’ before ‘TransA’
../../include/pdp_matrix.h:80: error: expected ‘)’ before ‘TransA’
../../include/pdp_matrix.h:84: error: expected ‘)’ before ‘TransA’
make[5]: *** [pdp_reg.o] Error 1
make[5]: Leaving directory `/home/muranyia/Download/pure-data/externals/pdp/modules/generic'
make[4]: *** [current] Error 2
make[4]: Leaving directory `/home/muranyia/Download/pure-data/externals/pdp/modules'
make[3]: *** [pdp_all] Error 2
make[3]: Leaving directory `/home/muranyia/Download/pure-data/externals/pdp'
make[2]: *** [/home/muranyia/Download/pure-data/externals/pdp/pdp.pd_linux] Error 2
make[2]: Leaving directory `/home/muranyia/Download/pure-data/externals'
make[1]: *** [externals_install] Error 2
make[1]: Leaving directory `/home/muranyia/Download/pure-data/packages'
make: *** [install] Error 2

You're missing a lib from here, I'm guessing libgsl0-dev. based on the "

error: gsl/gsl_block.h: No such file or directory"

http://puredata.info/docs/developer/Debian

.hc