Updated CMakeLists file to build developer guide within the Nektar++ tree.

CMakeLists.txt

+SET(USERGUIDESRC ${CMAKE_CURRENT_SOURCE_DIR})
+SET(USERGUIDE ${CMAKE_BINARY_DIR}/docs/developers-guide)
+
+FILE(MAKE_DIRECTORY ${USERGUIDE}/html)
+
+FIND_PROGRAM(HTLATEX htlatex)
+MARK_AS_ADVANCED(HTLATEX)
+ADD_CUSTOM_TARGET(developers-guide-html
+    export TEXINPUTS=${CMAKE_SOURCE_DIR}//:${USERGUIDESRC}//: &&
+    ${HTLATEX} ${USERGUIDESRC}/developers-guide.tex 
+    "${USERGUIDESRC}/styling.cfg,html,3,next,NoFonts"
+    WORKING_DIRECTORY ${USERGUIDE}/html
+)
+
+# If tex4ht successful, create img dir and copy images across
+FILE(GLOB_RECURSE imgfiles "img/*.png" "img/*.jpg" "*/img/*.png" "*/img/*.jpg")
+ADD_CUSTOM_COMMAND(TARGET developers-guide-html
+    POST_BUILD COMMAND ${CMAKE_COMMAND} -E make_directory ${USERGUIDE}/html/img)
+FOREACH(img ${imgfiles})
+    ADD_CUSTOM_COMMAND(TARGET developers-guide-html
+        POST_BUILD COMMAND 
+            ${CMAKE_COMMAND} -E copy ${img} ${USERGUIDE}/html/img)
+ENDFOREACH()
+
+FILE(GLOB_RECURSE pdffiles "*/img/*.pdf")
+FIND_PROGRAM(CONVERT convert)
+FOREACH(pdf ${pdffiles})
+    GET_FILENAME_COMPONENT(BASENAME ${pdf} NAME_WE)
+    ADD_CUSTOM_COMMAND(TARGET developers-guide-html
+        POST_BUILD COMMAND
+        ${CONVERT} ${pdf} ${USERGUIDE}/html/img/${BASENAME}.png)
+ENDFOREACH()
+
+
+FIND_PROGRAM(PDFLATEX pdflatex)
+MARK_AS_ADVANCED(PDFLATEX)
+FIND_PROGRAM(BIBTEX bibtex)
+MARK_AS_ADVANCED(BIBTEX)
+FIND_PROGRAM(MAKEINDEX makeindex)
+MARK_AS_ADVANCED(MAKEINDEX)
+
+ADD_CUSTOM_TARGET(developers-guide-pdf
+    export TEXINPUTS=${CMAKE_SOURCE_DIR}//: && 
+    ${PDFLATEX} --output-directory ${USERGUIDE} ${USERGUIDESRC}/developers-guide.tex
+    COMMAND TEXMFOUTPUT=${USERGUIDE} ${BIBTEX} ${USERGUIDE}/developers-guide.aux
+    COMMAND TEXMFOUTPUT=${USERGUIDE} ${MAKEINDEX} ${USERGUIDE}/developers-guide.idx
+    COMMAND TEXINPUTS=${CMAKE_SOURCE_DIR}//:  
+    ${PDFLATEX} --output-directory ${USERGUIDE} ${USERGUIDESRC}/developers-guide.tex
+    COMMAND TEXINPUTS=${CMAKE_SOURCE_DIR}//:  
+    ${PDFLATEX} --output-directory ${USERGUIDE} ${USERGUIDESRC}/developers-guide.tex
+    WORKING_DIRECTORY ${USERGUIDESRC}
+)