Make fails to install docs, so just skip them.
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,7 @@
 
 ACLOCAL_AMFLAGS = -I config
 
-SUBDIRS = include examples docs tests msc config
+SUBDIRS = include examples tests msc config
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = $(PACKAGE).pc
--- a/Makefile.in
+++ b/Makefile.in
@@ -173,7 +173,7 @@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 ACLOCAL_AMFLAGS = -I config
-SUBDIRS = include examples docs tests msc config
+SUBDIRS = include examples tests msc config
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = $(PACKAGE).pc
 EXTRA_DIST = $(PACKAGE).pc.in