diff --git a/examples/nxflat/tests/Makefile b/examples/nxflat/tests/Makefile
index 0f83f513728..814eb1801ad 100644
--- a/examples/nxflat/tests/Makefile
+++ b/examples/nxflat/tests/Makefile
@@ -22,16 +22,24 @@
 
 include $(APPDIR)/Make.defs
 
-# Most of these do no build yet
-#SUBDIRS	= errno hello hello++ longjmp mutex pthread signal task struct
-SUBDIRS		= errno hello struct
+# hello++ is left out: two of its four modules convert, the third needs
+# R_ARM_TARGET1 from the converter and the fourth needs an iostream.
+
+SUBDIRS		= errno hello signal struct
+
+# longjmp imports setjmp() and longjmp(), which the symbol table exports only
+# where NuttX supplies them itself.
+
+ifeq ($(CONFIG_ARCH_SETJMP_H),y)
+SUBDIRS		+= longjmp
+endif
 
 ifneq ($(CONFIG_DISABLE_PTHREAD),y)
-BUILD_SUBDIRS += mutex pthread
+SUBDIRS		+= mutex pthread
 endif
 
 ifneq ($(CONFIG_ARCH_ADDRENV),y)
-BUILD_SUBDIRS += task
+SUBDIRS		+= task
 endif
 
 NXFLAT_DIR	= $(APPDIR)/examples/nxflat
diff --git a/examples/nxflat/tests/errno/Makefile b/examples/nxflat/tests/errno/Makefile
index 43ee63d4e9c..d115de73c5b 100644
--- a/examples/nxflat/tests/errno/Makefile
+++ b/examples/nxflat/tests/errno/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/hello++/Makefile b/examples/nxflat/tests/hello++/Makefile
index 3202dd1b9c0..a0a58a6b087 100644
--- a/examples/nxflat/tests/hello++/Makefile
+++ b/examples/nxflat/tests/hello++/Makefile
@@ -149,16 +149,20 @@ $(BIN3): $(BIN3).r2
 #	$(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN1): $(BIN1)
-	$(Q) install -D $(BIN1) $(ROMFS_DIR)/$(BIN1)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN1) $(ROMFS_DIR)/$(BIN1)
 
 $(ROMFS_DIR)/$(BIN2): $(BIN2)
-	$(Q) install -D $(BIN2) $(ROMFS_DIR)/$(BIN2)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN2) $(ROMFS_DIR)/$(BIN2)
 
 $(ROMFS_DIR)/$(BIN3): $(BIN3)
-	$(Q) install -D $(BIN3) $(ROMFS_DIR)/$(BIN3)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN3) $(ROMFS_DIR)/$(BIN3)
 
 #$(ROMFS_DIR)/$(BIN4): $(BIN4)
-#	$(Q) install -D $(BIN4) $(ROMFS_DIR)/$(BIN4)
+#	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN4) $(ROMFS_DIR)/$(BIN4)
 
 install: $(ROMFS_DIR)/$(BIN1) $(ROMFS_DIR)/$(BIN2) $(ROMFS_DIR)/$(BIN3)
 
diff --git a/examples/nxflat/tests/hello/Makefile b/examples/nxflat/tests/hello/Makefile
index c176050953b..96b3c0b275a 100644
--- a/examples/nxflat/tests/hello/Makefile
+++ b/examples/nxflat/tests/hello/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/longjmp/Makefile b/examples/nxflat/tests/longjmp/Makefile
index d1dfdd6a444..12a7e89dde3 100644
--- a/examples/nxflat/tests/longjmp/Makefile
+++ b/examples/nxflat/tests/longjmp/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/mutex/Makefile b/examples/nxflat/tests/mutex/Makefile
index afdfc4966e0..0facbb638b6 100644
--- a/examples/nxflat/tests/mutex/Makefile
+++ b/examples/nxflat/tests/mutex/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/pthread/Makefile b/examples/nxflat/tests/pthread/Makefile
index 34eda9330c0..a699c777a43 100644
--- a/examples/nxflat/tests/pthread/Makefile
+++ b/examples/nxflat/tests/pthread/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/signal/Makefile b/examples/nxflat/tests/signal/Makefile
index 0fba3386436..0e0248df3c2 100644
--- a/examples/nxflat/tests/signal/Makefile
+++ b/examples/nxflat/tests/signal/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/struct/Makefile b/examples/nxflat/tests/struct/Makefile
index 463b2c260de..402cf117027 100644
--- a/examples/nxflat/tests/struct/Makefile
+++ b/examples/nxflat/tests/struct/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)
 
diff --git a/examples/nxflat/tests/task/Makefile b/examples/nxflat/tests/task/Makefile
index cb3473d6be6..3f6e7b033c7 100644
--- a/examples/nxflat/tests/task/Makefile
+++ b/examples/nxflat/tests/task/Makefile
@@ -57,7 +57,8 @@ $(BIN): $(BIN).r2
 	$(Q) $(LDNXFLAT) $(LDNXFLATFLAGS) -o $@ $^
 
 $(ROMFS_DIR)/$(BIN): $(BIN)
-	$(Q) install -D $(BIN) $(ROMFS_DIR)/$(BIN)
+	$(Q) mkdir -p $(ROMFS_DIR)
+	$(Q) install -m 0755 $(BIN) $(ROMFS_DIR)/$(BIN)
 
 install: $(ROMFS_DIR)/$(BIN)