Fix minor typos.

INSTALL

@@ -191,14 +191,14 @@ to first install the MacPorts package.  Follow their install procedure
 at: http://www.macports.org/install.php
 
 Then use their port command to install scons, and optionally git if you
-want to access the develpment source.
+want to access the development source.
 
 --------------------------------------------------------------
 # port install scons
 # port install git
 --------------------------------------------------------------
 
-While runnning gpsd, or scons check, you may run out of shared memory
+While running gpsd, or scons check, you may run out of shared memory
 segments.  If so, you will see this error message:
 
 --------------------------------------------------------------
@@ -255,7 +255,7 @@ testing PPS inputs.
 The rest of the installation is just as for any other source based
 install, as noted in the file *build.txt* .
 
-=== Other Debian derivitives (including stock) ===
+=== Other Debian derivatives (including stock) ===
 ==== Jessie ====
 --------------------------------------------------------------
 # apt-get install scons libncurses5-dev python-dev pps-tools

README

@@ -109,7 +109,7 @@ application engineer at SiRF.  He assisted us with the correction and
 tuning of the SiRF binary-protocol driver, shedding a good deal of
 light on murky aspects of the chip's behavior.
 
-We are also delighted to acknowlege the assistance of Timo Ylhainen, VP of
+We are also delighted to acknowledge the assistance of Timo Ylhainen, VP of
 Software Operations at Fastrax. He clarified a number of points about
 the iTalk protocol, helping to further development of iTalk support.
 

build.txt

@@ -371,8 +371,8 @@ stuff is left in place.
 If you interrupted a regression test, 'scons testclean' will remove
 generated test programs.
 
-You can run 'scons sconsclean' to temove most of the configuration
-state that scons keeps.  Be aware, however, thatr doing this can
+You can run 'scons sconsclean' to remove most of the configuration
+state that scons keeps.  Be aware, however, that doing this can
 confuse scons; you may need to run 'scons --config=force' afterwards
 to make your build succeed.