Fix check for installed components, such as gstreamer, 
on Ubuntu and other platforms that use ordered linking


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30495 023b2edf-31b2-4de3-b41e-bca80c47788f
Use streamoff instead of offs_type for std::streambuf::seekoff


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30496 023b2edf-31b2-4de3-b41e-bca80c47788f
More streamoff fixes

git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30497 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed libjpeg detection


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30504 023b2edf-31b2-4de3-b41e-bca80c47788f
Changed build system to split various link flags between LDFLAGS and LIBS variables. Gives better compatibility with various versions of linkers in various distributions.


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30507 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed compile and link issues with sound and video4linux2 plug ins.


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30509 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed .dep file usage in plug ins


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30510 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed building ESD plug on on OS-X


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30512 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed compile of v4l plug in on newer GNU compilers.


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30513 023b2edf-31b2-4de3-b41e-bca80c47788f
Merged revision(s) 30486-30515 from ptlib/branches/v2_12:
Fixed warnings on GNU 4.8.1

git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30516 023b2edf-31b2-4de3-b41e-bca80c47788f
Fixed compilation against different libjpeg library.


git-svn-id: svn://svn.code.sf.net/p/opalvoip/code/ptlib/trunk@30518 023b2edf-31b2-4de3-b41e-bca80c47788f