Installing gflags 12.04

Installing gflags 12.04

Manual package build (backport)

This is a very very verbose description - for anyone building a package for the first time.

1.    Install basic packages to build software and packages: build-essential   and devscripts  .

2.    Go to the source package (gflags) page at Launchpad:https://launchpad.net/ubuntu/+source/gflags

3.    Unfold the section for "The Quantal Quetzal (supported) 2.0-1" version.

4.    Locate the source package description file (.dsc extension). At the time of writing this ishttps://launchpad.net/ubuntu/+archive/primary/+files/gflags_2.0-1.dsc

5.    Copy the link to your clipboard.

6.    Open a terminal and download the source package using dget:

7.  dget https://launchpad.net/ubuntu/+archive/primary/+files/gflags_2.0-1.dsc

This will fail the first time:

gpg: Signature made Thu 31 May 2012 14:48:41 CEST using RSA key ID 8AE09345

gpg: Can't check signature: public key not found

Validation FAILED!!

8.    Install the required RSA key as in the error message above:

9.  gpg --keyserver keyserver.ubuntu.com --recv-key 8AE09345

10.  Configure the DPKG development scripts to use your GPG keyring:

11. echo 'DSCVERIFY_KEYRINGS="/etc/apt/trusted.gpg:~/.gnupg/pubring.gpg"' > ~/.devscripts

See Added key, but dget still shows "gpg: Can't check signature: public key not found" for why.

12.  Run the earlier dget command again. This should now succeed.

13.  Hop into the directory created:

14. cd gflags-2.0/

15.  Try building the package.

16. debuild -uc -us

Explanation for the options: unsigned changes file, unsigned new .dsc file. As you are not redistributing the package, there's no need to sign anything.

This may fail due to missing build dependencies, e.g.:

dpkg-checkbuilddeps: Unmet build dependencies: debhelper

Note this is really system specific.

17.  Install the build dependencies (satisfy all above from the output you get), e.g.:

18. sudo apt-get install debhelper

19.  Try building the package again:

20. debuild -uc -us

21.  One directory below, you'll find your packages, e.g.:

22. $ cd ..

23. $ ls -al *gflags*.deb

24. -rw-r--r-- 1 gert gert 108450 Jun 24 18:59 libgflags2_2.0-1_amd64.deb

25. -rw-r--r-- 1 gert gert 147590 Jun 24 18:59 libgflags-dev_2.0-1_amd64.deb

26. -rw-r--r-- 1 gert gert  14778 Jun 24 18:59 libgflags-doc_2.0-1_all.deb

27.  Install them:

28. sudo dpkg -i *gflags*.deb

In case this fails because of binary dependencies not satisfied, run

sudo apt-get install -f

Done!

Original Source: http://askubuntu.com/questions/312173/installing-gflags-12-04