Version 0.5.2 used to shipped a debian/* directory. This directory was removed from upstream
--- igraph-0.5.2/Makefile.in.orig 2009-09-15 16:22:41.000000000 +0200
+++ igraph-0.5.2/Makefile.in 2009-09-15 16:23:22.000000000 +0200
@@ -212,7 +212,7 @@
target_alias = @target_alias@
top_builddir = @top_builddir@
top_srcdir = @top_srcdir@
-SUBDIRS = src debian tests interfaces
+SUBDIRS = src tests interfaces
DOC_FILES = $(top_builddir)/doc/book/Makefile.in \
$(top_builddir)/doc/igraph-docs.info \
$(top_srcdir)/doc/Makefile.in \
--- igraph-0.5.2/Makefile.am.orig 2009-09-15 16:19:19.000000000 +0200
+++ igraph-0.5.2/Makefile.am 2009-09-15 16:19:24.000000000 +0200
@@ -1,6 +1,6 @@
-SUBDIRS=src debian tests interfaces
+SUBDIRS=src tests interfaces
DOC_FILES = $(top_builddir)/doc/book/Makefile.in \
$(top_builddir)/doc/igraph-docs.info \
$(top_srcdir)/doc/Makefile.in \
--- igraph-0.5.2/configure.in.orig 2009-09-15 16:22:58.000000000 +0200
+++ igraph-0.5.2/configure.in 2009-09-15 16:23:28.000000000 +0200
@@ -213,7 +213,7 @@
AC_PROG_LN_S
fi
-AC_CONFIG_FILES([Makefile src/Makefile igraph.pc igraph_Info.plist debian/Makefile doc/Makefile doc/book/Makefile interfaces/R/configure.in interfaces/R/Makefile interfaces/R/src/Makevars.win interfaces/R/DESCRIPTION interfaces/Makefile interfaces/shell/Makefile])
+AC_CONFIG_FILES([Makefile src/Makefile igraph.pc igraph_Info.plist doc/Makefile doc/book/Makefile interfaces/R/configure.in interfaces/R/Makefile interfaces/R/src/Makevars.win interfaces/R/DESCRIPTION interfaces/Makefile interfaces/shell/Makefile])
AC_OUTPUT
AC_MSG_RESULT([igraph successfully configured.])
--- igraph-0.5.2/configure.orig 2009-09-15 16:23:05.000000000 +0200
+++ igraph-0.5.2/configure 2009-09-15 16:23:39.000000000 +0200
@@ -18374,7 +18374,7 @@
fi
-ac_config_files="$ac_config_files Makefile src/Makefile igraph.pc igraph_Info.plist debian/Makefile doc/Makefile doc/book/Makefile interfaces/R/configure.in interfaces/R/Makefile interfaces/R/src/Makevars.win interfaces/R/DESCRIPTION interfaces/Makefile interfaces/shell/Makefile"
+ac_config_files="$ac_config_files Makefile src/Makefile igraph.pc igraph_Info.plist doc/Makefile doc/book/Makefile interfaces/R/configure.in interfaces/R/Makefile interfaces/R/src/Makevars.win interfaces/R/DESCRIPTION interfaces/Makefile interfaces/shell/Makefile"
cat >confcache <<\_ACEOF
# This file is a shell script that caches the results of configure
@@ -19357,7 +19357,6 @@
"src/Makefile") CONFIG_FILES="$CONFIG_FILES src/Makefile" ;;
"igraph.pc") CONFIG_FILES="$CONFIG_FILES igraph.pc" ;;
"igraph_Info.plist") CONFIG_FILES="$CONFIG_FILES igraph_Info.plist" ;;
- "debian/Makefile") CONFIG_FILES="$CONFIG_FILES debian/Makefile" ;;
"doc/Makefile") CONFIG_FILES="$CONFIG_FILES doc/Makefile" ;;
"doc/book/Makefile") CONFIG_FILES="$CONFIG_FILES doc/book/Makefile" ;;
"interfaces/R/configure.in") CONFIG_FILES="$CONFIG_FILES interfaces/R/configure.in" ;;