diff --git a/Makefile b/Makefile
index 02228910a..5040d2884 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ makefiles = \
   misc/systemd/local.mk \
   misc/launchd/local.mk \
   misc/upstart/local.mk \
-  # doc/manual/local.mk \
+  doc/manual/local.mk \
   tests/local.mk \
   tests/plugins/local.mk
 
@@ -34,5 +34,4 @@ endif
 
 include mk/lib.mk
 
-# GLOBAL_CXXFLAGS += -g -Wall -include config.h -std=c++17 -fstack-usage
 GLOBAL_CXXFLAGS += -g -Wall -include config.h -std=c++17 -I src
diff --git a/doc/manual/manual.is-valid b/doc/manual/manual.is-valid
deleted file mode 100644
index e69de29bb..000000000
diff --git a/src/libcmd/local.mk b/src/libcmd/local.mk
index a12837ce5..73a1a1086 100644
--- a/src/libcmd/local.mk
+++ b/src/libcmd/local.mk
@@ -8,9 +8,7 @@ libcmd_SOURCES := $(wildcard $(d)/*.cc)
 
 libcmd_CXXFLAGS += -I src/libutil -I src/libstore -I src/libexpr -I src/libmain -I src/libfetchers -I src/nix
 
-# libcmd_LDFLAGS += -llowdown -pthread
 libcmd_LDFLAGS = $(EDITLINE_LIBS) -llowdown -pthread
-# libcmd_LDFLAGS += $(LOWDOWN_LIBS) -pthread
 
 libcmd_LIBS = libstore libutil libexpr libmain libfetchers libnix