Build instructions:

BlueGps can be build as part of an Android ROM like Replicant with the following steps:
Clone the repository to the apps folder in the source code tree:
git clone https://code.fossencdi.org/BlueGPS.git packages/apps/BlueGps
Then add "BlueGps" to the PRODUCT_PACKAGES list, so it is automatically included in your next build.
I have it added the following way in the vendor/replicant folder:
--- a/config/common.mk
+++ b/config/common.mk
@@ -166,7 +166,8 @@ PRODUCT_PACKAGES += \
     SoundRecorder \
     Screencast \
     F-Droid \
-    FDroidPrivilegedExtension
+    FDroidPrivilegedExtension \
+    BlueGps


Changelog:

BlueGps4Droid 1.2.6 (2015-12-29)
* on Android 6 the check for the status of the mock location provider did not work and needed fixing

*"BlueGps4Droid 1.2.5":http://sourceforge.net/projects/bluegps4droid/files/Apk/BlueGPS4Droid_1.2.x/BlueGps4Droid_1.2.5.apk/download (2012-05-01)*
* Add Portuguese translation (thanks to rsantospereira (XDA: rikpereira) and meiji (XDA: meiji.emperor))

BlueGps4Droid 1.2.4 (2012-03-27)
* Bug fix (Ticket #9: "Handle NMEA timestamps without fractional seconds":https://sourceforge.net/p/bluegps4droid/tickets/9/ ) (thanks to Jeffrey Hutzelman)
* Update copyright info in source and about app message

BlueGps4Droid 1.2.3 (2011-09-08)
* Add Russian translation (thanks to skleroz)

BlueGps4Droid 1.2.2 (2011-05-14)
* Add an option to force auto-activation of the chosen location provider (useful when the device defines a GPS provider but doesn't provide the preferences used to enable/disable it).
* Update copyright infos.
* Decrease the alleged power consumption of the bluetooth GPS (so now bluetooth GPS should consume less power than internal GPS).
* Change default retries number before auto-closing BlueGPS4Droid. 
* Bug fix (Ticket #5: "BlueGPS loops forever when SIRF is enabled but connection cannot be established":https://sourceforge.net/p/bluegps4droid/tickets/5/ ). 
* Bug fixed (Ticket #6: "Cannot add mock provider if it exists already":https://sourceforge.net/p/bluegps4droid/tickets/6/ ). 
* Closing of bluetooth connection improvements. 

BlueGps4Droid 1.2.1 (2011-01-20)
* Add Spanish translation (thanks to "Colegota - XDA-Developers":http://forum.xda-developers.com/showpost.php?p=10628971&postcount=55 )
* Change launcher and notification icons.  The new icons are inspired from "XlAfbk's proposition":http://forum.xda-developers.com/showpost.php?p=10277778&postcount=29.

BlueGps4Droid 1.2.0 (2010-12-10)
* Add SiRF configuration management (NMEA sentences - SBAS - Static Navigation)
* Add verifications: if bluetooth or mock locations are not enabled, the service is not started.
* Add alert messages to explain why the service cannot be started if bluetooth or mock locations are not enabled 
* If device doesn't have an internal GPS, the bluetooth GPS provider is enabled automatically
* Add an _about window_ that gives the version of application, licensing information and where the sources may be downloaded.

BlueGps4Droid 1.2 alpha (2010-10-25)
* SiRF configuration management (NMEA sentences - SBAS - Static Navigation)

*BlueGps4Droid 1.1.2* (2010-11-04)
* Add verifications: if bluetooth or mock locations are not enabled, the service is not started.
* Add alert messages to explain why the service cannot be started if bluetooth or mock locations are not enabled 
* If device doesn't have an internal GPS, the bluetooth GPS provider will be enabled automatically

BlueGps4Droid 1.1.1 (2010-09-29)
* Bug fix (Ticket #4: Connection service is not properly closed https://sourceforge.net/p/bluegps4droid/tickets/4/).
* Add notifications when the connection with the GPS fails and when the connection service is closed because of two many connection retry.
* Add settings to choose the number of connection retries before exiting.
	
BlueGps4Droid 1.1 (2010-09-26) - does not work properly because of bug #4. Use either version 1.0 or 1.1.1 !
* Reconnect automatically when the connection with the GPS is lost (5 attempts in 5 minutes)
* Replace Android default internal GPS or use a new location provider 
* Send status notifications when GPS loses fix or is disconnected.
    
*BlueGps4Droid 1.0.1* (2010-10-25)
* Add verifications: if bluetooth or mock locations are not enabled, the service is not started.
* Add alert messages to explain why the service cannot be started if bluetooth or mock locations are not enabled 
* If device doesn't have an internal GPS, the bluetooth GPS provider will be enabled automatically
    
BlueGps4Droid 1.0 (2010-09-12)
* Connect to bluetooth GPS (NMEA) and replace the internal GPS of an Android device.
* Record GPS tracks in NMEA files 
* Compatible with Android version 2.0 and above
* English and French translations