diff --git a/libs/spandsp3/Makefile b/libs/spandsp3/Makefile
index 0888584..3e4dace 100644
--- a/libs/spandsp3/Makefile
+++ b/libs/spandsp3/Makefile
@@ -22,6 +22,8 @@ PKG_LICENSE:=LGPL-2.1-or-later GPL-2.0-or-later
 PKG_LICENSE_FILES:=COPYING
 PKG_MAINTAINER:=Jiri Slachta <jiri@slachta.eu>
 
+PKG_BUILD_DEPENDS:=tiff/host
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/libspandsp3
@@ -34,6 +36,10 @@ define Package/libspandsp3
   ABI_VERSION:=3
 endef
 
+CONFIGURE_VARS += \
+	CC_FOR_BUILD="$(HOSTCC)" \
+	CPPFLAGS_FOR_BUILD="$(HOST_CPPFLAGS)"
+
 # Use fixed point math when soft float support is enabled for target devices.
 ifeq ($(CONFIG_SOFT_FLOAT),y)
 CONFIGURE_ARGS+= \
diff --git a/libs/spandsp3/patches/01-spandsp3-pkg-config.patch b/libs/spandsp3/patches/100-spandsp3-pkg-config.patch
similarity index 100%
rename from libs/spandsp3/patches/01-spandsp3-pkg-config.patch
rename to libs/spandsp3/patches/100-spandsp3-pkg-config.patch
diff --git a/libs/spandsp3/patches/02-do-not-check-for-libxml2.patch b/libs/spandsp3/patches/101-do-not-check-for-libxml2.patch
similarity index 95%
rename from libs/spandsp3/patches/02-do-not-check-for-libxml2.patch
rename to libs/spandsp3/patches/101-do-not-check-for-libxml2.patch
index 25aefae..be3f569 100644
--- a/libs/spandsp3/patches/02-do-not-check-for-libxml2.patch
+++ b/libs/spandsp3/patches/101-do-not-check-for-libxml2.patch
@@ -10,7 +10,7 @@
  # Determine XML2 include path
  AC_MSG_CHECKING(for libxml/xmlmemory.h)
  
-@@ -259,6 +262,7 @@ fi
+@@ -254,6 +257,7 @@ fi
  AC_CHECK_HEADERS([libxml/xmlmemory.h])
  AC_CHECK_HEADERS([libxml/parser.h])
  AC_CHECK_HEADERS([libxml/xinclude.h])
diff --git a/libs/spandsp3/patches/103-Permit-to-provide-custom-CPPFLAGS_FOR_BUILD.patch b/libs/spandsp3/patches/103-Permit-to-provide-custom-CPPFLAGS_FOR_BUILD.patch
new file mode 100644
index 0000000..b4ef3d1
--- /dev/null
+++ b/libs/spandsp3/patches/103-Permit-to-provide-custom-CPPFLAGS_FOR_BUILD.patch
@@ -0,0 +1,27 @@
+From b9aa8b79270bb5241508b2c3864c8069f73e75e5 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Thu, 20 Nov 2025 16:39:06 +0100
+Subject: [PATCH 1/2] Permit to provide custom CPPFLAGS_FOR_BUILD
+
+In the context of cross compilation the CPPFLAGS for the target might be
+different than the one for build tools.
+
+Permit to provide custom CPPFLAGS_FOR_BUILD value to handle this
+scenario.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -61,7 +61,7 @@ then
+     # are not the same, we set reasonable default values for the tools.
+ 
+     CC_FOR_BUILD=${CC_FOR_BUILD-gcc}
+-    CPPFLAGS_FOR_BUILD="\$(CPPFLAGS)"
++    CPPFLAGS_FOR_BUILD=${CPPFLAGS_FOR_BUILD-"\$(CPPFLAGS)"}
+     CC=${CC-${host_alias}-gcc}
+     CFLAGS=${CFLAGS-"-g -O2"}
+     CXX=${CXX-${host_alias}-c++}
diff --git a/libs/spandsp3/patches/104-Propagate-CPPFLAGS_FOR_BUILD-for-build-tools.patch b/libs/spandsp3/patches/104-Propagate-CPPFLAGS_FOR_BUILD-for-build-tools.patch
new file mode 100644
index 0000000..5d3a6d1
--- /dev/null
+++ b/libs/spandsp3/patches/104-Propagate-CPPFLAGS_FOR_BUILD-for-build-tools.patch
@@ -0,0 +1,78 @@
+From 6f5014881a436cf2ad2a87e3e2e2a0594dc83ff7 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Thu, 20 Nov 2025 16:40:44 +0100
+Subject: [PATCH 2/2] Propagate CPPFLAGS_FOR_BUILD for build tools
+
+On building build tools, only CC_FOR_BUILD is used with
+CPPFLAGS_FOR_BUILD never actually passed. This was probably an oversight
+when CPPFLAGS_FOR_BUILD was introduced.
+
+This is especially needed on cross compilation where the header are
+placed on a standard location.
+
+To address this case, and make building build tool more robust, actually
+pass the CPPFLAGS_FOR_BUILD for each tool.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ src/Makefile.am | 24 ++++++++++++------------
+ 1 file changed, 12 insertions(+), 12 deletions(-)
+
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -395,43 +395,43 @@ noinst_HEADERS = cielab_luts.h \
+                  v34_tables.h
+ 
+ make_at_dictionary$(EXEEXT): $(top_srcdir)/src/make_at_dictionary.c
+-	$(CC_FOR_BUILD) -o make_at_dictionary$(EXEEXT) $(top_srcdir)/src/make_at_dictionary.c -DHAVE_CONFIG_H -I$(top_builddir)/src
++	$(CC_FOR_BUILD) -o make_at_dictionary$(EXEEXT) $(top_srcdir)/src/make_at_dictionary.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src
+ 
+ make_cielab_luts$(EXEEXT): $(top_srcdir)/src/make_cielab_luts.c
+-	$(CC_FOR_BUILD) -o make_cielab_luts$(EXEEXT) $(top_srcdir)/src/make_cielab_luts.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_cielab_luts$(EXEEXT) $(top_srcdir)/src/make_cielab_luts.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_math_fixed_tables$(EXEEXT): $(top_srcdir)/src/make_math_fixed_tables.c
+-	$(CC_FOR_BUILD) -o make_math_fixed_tables$(EXEEXT) $(top_srcdir)/src/make_math_fixed_tables.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_math_fixed_tables$(EXEEXT) $(top_srcdir)/src/make_math_fixed_tables.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_modem_filter$(EXEEXT): $(top_srcdir)/src/make_modem_filter.c $(top_srcdir)/src/filter_tools.c
+-	$(CC_FOR_BUILD) -o make_modem_filter$(EXEEXT) $(top_srcdir)/src/make_modem_filter.c $(top_srcdir)/src/filter_tools.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_modem_filter$(EXEEXT) $(top_srcdir)/src/make_modem_filter.c $(top_srcdir)/src/filter_tools.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_modem_godard_descriptor$(EXEEXT): $(top_srcdir)/src/make_modem_godard_descriptor.c $(top_srcdir)/src/filter_tools.c
+-	$(CC_FOR_BUILD) -o make_modem_godard_descriptor$(EXEEXT) $(top_srcdir)/src/make_modem_godard_descriptor.c $(top_srcdir)/src/filter_tools.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_modem_godard_descriptor$(EXEEXT) $(top_srcdir)/src/make_modem_godard_descriptor.c $(top_srcdir)/src/filter_tools.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_t43_gray_code_tables$(EXEEXT): $(top_srcdir)/src/make_t43_gray_code_tables.c
+-	$(CC_FOR_BUILD) -o make_t43_gray_code_tables$(EXEEXT) $(top_srcdir)/src/make_t43_gray_code_tables.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_t43_gray_code_tables$(EXEEXT) $(top_srcdir)/src/make_t43_gray_code_tables.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v17_v32_constellation_map$(EXEEXT): $(top_srcdir)/src/make_v17_v32_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c
+-	$(CC_FOR_BUILD) -o make_v17_v32_constellation_map$(EXEEXT) $(top_srcdir)/src/make_v17_v32_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_v17_v32_constellation_map$(EXEEXT) $(top_srcdir)/src/make_v17_v32_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v17_v32_convolutional_encoder$(EXEEXT): $(top_srcdir)/src/make_v17_v32_convolutional_encoder.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c
+-	$(CC_FOR_BUILD) -o make_v17_v32_convolutional_encoder$(EXEEXT) $(top_srcdir)/src/make_v17_v32_convolutional_encoder.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_v17_v32_convolutional_encoder$(EXEEXT) $(top_srcdir)/src/make_v17_v32_convolutional_encoder.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v29_constellation_map$(EXEEXT): $(top_srcdir)/src/make_v29_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c
+-	$(CC_FOR_BUILD) -o make_v29_constellation_map$(EXEEXT) $(top_srcdir)/src/make_v29_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_v29_constellation_map$(EXEEXT) $(top_srcdir)/src/make_v29_constellation_map.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v34_convolutional_coders$(EXEEXT): $(top_srcdir)/src/make_v34_convolutional_coders.c
+-	$(CC_FOR_BUILD) -o make_v34_convolutional_coders$(EXEEXT) $(top_srcdir)/src/make_v34_convolutional_coders.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_v34_convolutional_coders$(EXEEXT) $(top_srcdir)/src/make_v34_convolutional_coders.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v34_probe_signals$(EXEEXT): $(top_srcdir)/src/make_v34_probe_signals.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c
+-	$(CC_FOR_BUILD) -o make_v34_probe_signals$(EXEEXT) $(top_srcdir)/src/make_v34_probe_signals.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
++	$(CC_FOR_BUILD) -o make_v34_probe_signals$(EXEEXT) $(top_srcdir)/src/make_v34_probe_signals.c $(top_srcdir)/src/g711.c $(top_srcdir)/src/alloc.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -lm
+ 
+ make_v34_shell_map$(EXEEXT): $(top_srcdir)/src/make_v34_shell_map.c
+ 	$(CC_FOR_BUILD) -o make_v34_shell_map$(EXEEXT) $(top_srcdir)/src/make_v34_shell_map.c -DHAVE_CONFIG_H -I$(top_builddir)/src
+ 
+ make_v34_tx_pre_emphasis_filters$(EXEEXT): $(top_srcdir)/src/make_v34_tx_pre_emphasis_filters.c $(top_srcdir)/tools/meteor-engine.c
+-	$(CC_FOR_BUILD) -o make_v34_tx_pre_emphasis_filters$(EXEEXT) $(top_srcdir)/src/make_v34_tx_pre_emphasis_filters.c $(top_srcdir)/tools/meteor-engine.c -DHAVE_CONFIG_H -I$(top_builddir)/src -I$(top_builddir)/tools -lm
++	$(CC_FOR_BUILD) -o make_v34_tx_pre_emphasis_filters$(EXEEXT) $(top_srcdir)/src/make_v34_tx_pre_emphasis_filters.c $(top_srcdir)/tools/meteor-engine.c $(CPPFLAGS_FOR_BUILD) -DHAVE_CONFIG_H -I$(top_builddir)/src -I$(top_builddir)/tools -lm
+ 
+ # We need to run make_at_dictionary, so it generates the
+ # at_interpreter_dictionary.h file