File texmaker-pdflatex-synctex-by-default.patch of Package texmaker
diff -ur texmaker-2.2//texmaker.cpp texmaker-2.2.NEW//texmaker.cpp
--- texmaker-2.2//texmaker.cpp 2011-01-26 04:17:07.000000000 +0530
+++ texmaker-2.2.NEW//texmaker.cpp 2011-01-26 23:09:40.461135444 +0530
@@ -2617,7 +2617,7 @@
ps2pdf_command=config->value("Tools/Ps2pdf","ps2pdf %.ps").toString();
makeindex_command=config->value("Tools/Makeindex","makeindex %.idx").toString();
bibtex_command=config->value("Tools/Bibtex","bibtex %.aux").toString();
-pdflatex_command=config->value("Tools/Pdflatex","pdflatex -interaction=nonstopmode %.tex").toString();
+pdflatex_command=config->value("Tools/Pdflatex","pdflatex -synctex=1 -interaction=nonstopmode %.tex").toString();
dvipdf_command=config->value("Tools/Dvipdf","dvipdfm %.dvi").toString();
metapost_command=config->value("Tools/Metapost","mpost --interaction nonstopmode ").toString();
// xdvi %.dvi -sourceposition @:%.tex