diff --git a/doc/contributing/Makefile b/doc/contributing/Makefile
index 14b89193f..2e9d5b5a2 100644
--- a/doc/contributing/Makefile
+++ b/doc/contributing/Makefile
@@ -1,23 +1,11 @@
 # Makefile for Sphinx documentation
 #
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
+include $(CURDIR)/../sphinx/defines.mk
 
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
 # Additional variables for figures, not sphinx default:
-DIA = dia
-EPSTOPDF = epstopdf
 FIGURES = source/figures
 IMAGES_EPS = \
 
diff --git a/doc/installation/Makefile b/doc/installation/Makefile
index 85e3da751..7b3aab92c 100644
--- a/doc/installation/Makefile
+++ b/doc/installation/Makefile
@@ -1,23 +1,11 @@
 # Makefile for Sphinx documentation
 #
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
+include $(CURDIR)/../sphinx/defines.mk
 
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
 # Additional variables for figures, not sphinx default:
-DIA = dia
-EPSTOPDF = epstopdf
 FIGURES = source/figures
 IMAGES_EPS = \
 
diff --git a/doc/manual/Makefile b/doc/manual/Makefile
index 2261e03e4..efc4aedc6 100644
--- a/doc/manual/Makefile
+++ b/doc/manual/Makefile
@@ -1,6 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
+include $(CURDIR)/../sphinx/defines.mk
 
 SRC = ../../src
 # Temporary source directory, for build
@@ -139,15 +137,7 @@ RESCALE = ../../utils/rescale-pdf.sh
 	@$(EPSTOPDF) $< -o=$@ >/dev/null
 	@if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCETEMP)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/doc/models/Makefile b/doc/models/Makefile
index 0d0731309..23fbb4072 100644
--- a/doc/models/Makefile
+++ b/doc/models/Makefile
@@ -1,6 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
+include $(CURDIR)/../sphinx/defines.mk
 
 SRC = ../../src
 # Temporary source directory, for build
@@ -603,15 +601,7 @@ RESCALE = ../../utils/rescale-pdf.sh
 	@$(EPSTOPDF) $< -o=$@ >/dev/null
 	@if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCETEMP)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/doc/sphinx/defines.mk b/doc/sphinx/defines.mk
new file mode 100644
index 000000000..1b9a86c70
--- /dev/null
+++ b/doc/sphinx/defines.mk
@@ -0,0 +1,14 @@
+CONVERT = convert -density 300
+DIA = dia
+DOT = dot
+EPSTOPDF = epstopdf
+
+# You can set these variables from the command line.
+SPHINXOPTS    = -W --keep-going
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = build
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
diff --git a/doc/tutorial/Makefile b/doc/tutorial/Makefile
index 85e3da751..7b3aab92c 100644
--- a/doc/tutorial/Makefile
+++ b/doc/tutorial/Makefile
@@ -1,23 +1,11 @@
 # Makefile for Sphinx documentation
 #
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
+include $(CURDIR)/../sphinx/defines.mk
 
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
 # Additional variables for figures, not sphinx default:
-DIA = dia
-EPSTOPDF = epstopdf
 FIGURES = source/figures
 IMAGES_EPS = \
 
diff --git a/src/antenna/doc/Makefile b/src/antenna/doc/Makefile
index cc68d7813..7025b8419 100644
--- a/src/antenna/doc/Makefile
+++ b/src/antenna/doc/Makefile
@@ -1,6 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
+include $(CURDIR)/../../../doc/sphinx/defines.mk
 
 SOURCE = source
 FIGURES = $(SOURCE)/figures
@@ -39,15 +37,7 @@ GRAPHS = $(GRAPHS_EPS) $(GRAPHS_PNG) $(GRAPHS_PDF)
 	$(EPSTOPDF) $< -o=$@
 	@if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCE)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/src/buildings/doc/Makefile b/src/buildings/doc/Makefile
index a1859680b..4a9c8814e 100644
--- a/src/buildings/doc/Makefile
+++ b/src/buildings/doc/Makefile
@@ -1,6 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-CONVERT = convert -density 300
+include $(CURDIR)/../../../doc/sphinx/defines.mk
 
 SOURCE = source
 FIGURES = $(SOURCE)/figures
@@ -39,15 +37,7 @@ GRAPHS = $(GRAPHS_EPS) $(GRAPHS_PNG) $(GRAPHS_PDF)
 	$(EPSTOPDF) $< -o=$@
 	@if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCE)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/src/lte/doc/Makefile b/src/lte/doc/Makefile
index 9befcb2fb..a5d8fcfc4 100644
--- a/src/lte/doc/Makefile
+++ b/src/lte/doc/Makefile
@@ -1,9 +1,6 @@
-EPSTOPDF = epstopdf
-DIA = dia
-SEQDIAG = seqdiag
-DOT = dot
-CONVERT = convert -density 250
+include $(CURDIR)/../../../doc/sphinx/defines.mk
 
+SEQDIAG = seqdiag
 
 SOURCE = source
 FIGURES = $(SOURCE)/figures
@@ -221,16 +218,7 @@ RESCALE = ../../../utils/rescale-pdf.sh
 	$(EPSTOPDF) $< -o=$@
 	if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCE)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/src/mesh/doc/Makefile b/src/mesh/doc/Makefile
index 1248488a2..140f8ecb7 100644
--- a/src/mesh/doc/Makefile
+++ b/src/mesh/doc/Makefile
@@ -1,8 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-DOT = dot
-CONVERT = convert -density 250
-
+include $(CURDIR)/../../../doc/sphinx/defines.mk
 
 SOURCE = source
 FIGURES = $(SOURCE)/figures
@@ -39,16 +35,7 @@ RESCALE = ../../../utils/rescale-pdf.sh
 	$(EPSTOPDF) $< -o=$@
 	if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCE)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
diff --git a/src/wifi/doc/Makefile b/src/wifi/doc/Makefile
index a5b1246b0..cd2721400 100644
--- a/src/wifi/doc/Makefile
+++ b/src/wifi/doc/Makefile
@@ -1,7 +1,4 @@
-EPSTOPDF = epstopdf
-DIA = dia
-DOT = dot
-CONVERT = convert -density 120
+include $(CURDIR)/../../../doc/sphinx/defines.mk
 
 SOURCE = source
 FIGURES = $(SOURCE)/figures
@@ -64,16 +61,7 @@ RESCALE = ../../../utils/rescale-pdf.sh
 	$(EPSTOPDF) $< -o=$@
 	if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
-
-# You can set these variables from the command line.
-SPHINXOPTS    = -W --keep-going
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = build
-
 # Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
 ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) $(SOURCE)
 
 .PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest