diff --git a/depends/hosts/linux.mk b/depends/hosts/linux.mk
index 3805d2307..4895b1e30 100644
--- a/depends/hosts/linux.mk
+++ b/depends/hosts/linux.mk
@@ -10,15 +10,15 @@ linux_debug_CXXFLAGS=$(linux_debug_CFLAGS)
 linux_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC
 
 ifeq (86,$(findstring 86,$(build_arch)))
-i686_linux_CC=gcc -m32
-i686_linux_CXX=g++ -m32
+i686_linux_CC=$(CC) -m32
+i686_linux_CXX=$(CXX) -m32
 i686_linux_AR=ar
 i686_linux_RANLIB=ranlib
 i686_linux_NM=nm
 i686_linux_STRIP=strip
 
-x86_64_linux_CC=gcc -m64
-x86_64_linux_CXX=g++ -m64
+x86_64_linux_CC=$(CC) -m64
+x86_64_linux_CXX=$(CXX) -m64
 x86_64_linux_AR=ar
 x86_64_linux_RANLIB=ranlib
 x86_64_linux_NM=nm
diff --git a/depends/packages/bdb.mk b/depends/packages/bdb.mk
index 6b8b8e144..08c5793fb 100644
--- a/depends/packages/bdb.mk
+++ b/depends/packages/bdb.mk
@@ -14,7 +14,8 @@ ifneq ($(build_os),darwin)
 $(package)_config_opts_darwin=--disable-atomicsupport
 endif
 $(package)_config_opts_aarch64=--disable-atomicsupport
-$(package)_cxxflags+=-std=c++11
+$(package)_cxxflags+=-std=c++11 -fPIE
+$(package)_cflags+=-std=gnu17 -fPIE
 endef
 
 define $(package)_preprocess_cmds
diff --git a/depends/packages/libgmp.mk b/depends/packages/libgmp.mk
index 4ec7cde16..b154932eb 100644
--- a/depends/packages/libgmp.mk
+++ b/depends/packages/libgmp.mk
@@ -1,5 +1,6 @@
 package=libgmp
 
+
 ifeq ($(host_os),mingw32)
 $(package)_download_path=https://github.com/radix42/$(package)/archive
 $(package)_file_name=$(package)-$($(package)_git_commit).tar.gz
@@ -16,6 +17,7 @@ $(package)_file_name=d613c855-cd92-4efb-b893-658496852019
 $(package)_download_file=d613c855-cd92-4efb-b893-658496852019
 $(package)_sha256_hash=a8109865f2893f1373b0a8ed5ff7429de8db696fc451b1036bd7bdf95bbeffd6
 $(package)_config_opts=--enable-cxx --disable-shared
+$(package)_patches=gcc-15.patch
 endif
 
 #else
@@ -27,6 +29,10 @@ endif
 #$(package)_config_opts=--enable-cxx --disable-shared
 #endif
 
+define $(package)_preprocess_cmds
+  patch -p1 < $($(package)_patch_dir)/gcc-15.patch
+endef
+
 define $(package)_config_cmds
   $($(package)_autoconf) --host=$(host) --build=$(build)
 endef
diff --git a/depends/packages/libsodium.mk b/depends/packages/libsodium.mk
index 2d930c4ae..787abae91 100644
--- a/depends/packages/libsodium.mk
+++ b/depends/packages/libsodium.mk
@@ -6,6 +6,8 @@ $(package)_download_file=0d9f589e-a9f9-4ddb-acaa-0f1b423b32eb
 $(package)_sha256_hash=6f504490b342a4f8a4c4a02fc9b866cbef8622d5df4e5452b46be121e46636c1
 $(package)_dependencies=
 $(package)_config_opts=
+$(package)_cflags=-std=gnu17
+
 ifeq ($(build_os),darwin)
 define $(package)_set_vars
   $(package)_build_env=MACOSX_DEPLOYMENT_TARGET="10.11"
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 8c8cfadc8..1324ad7d6 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -39,8 +39,8 @@ native_packages := native_ccache
 wallet_packages=bdb
 
 ifeq ($(host_os),linux)
-	packages := boost wolfssl libevent $(zcash_packages) googletest libcurl #googlemock
+	packages := boost wolfssl libevent $(zcash_packages) libcurl #googlemock googletest
 else
-	packages := boost wolfssl libevent  $(zcash_packages) libcurl googletest #googlemock
+	packages := boost wolfssl libevent  $(zcash_packages) libcurl #googlemock googletest
 endif
 
diff --git a/depends/packages/wolfssl.mk b/depends/packages/wolfssl.mk
index 21b95e0ab..0c32d2de2 100644
--- a/depends/packages/wolfssl.mk
+++ b/depends/packages/wolfssl.mk
@@ -20,6 +20,7 @@ $(package)_download_path=https://github.com/wolfSSL/wolfssl/archive
 $(package)_download_file=v$($(package)_version)-stable.tar.gz
 
 define $(package)_set_vars
+$(package)_cflags+=-std=gnu17
 $(package)_config_env=AR="$($(package)_ar)" RANLIB="$($(package)_ranlib)" CC="$($(package)_cc)"
 $(package)_config_opts=--prefix=$(host_prefix)
 $(package)_config_opts+=--host=$(host)
@@ -64,7 +65,7 @@ endef
 #endef
 
 define $(package)_build_cmds
-  $(MAKE) CPPFLAGS='-fPIC' -j1 src/libwolfssl.la
+  $(MAKE) CPPFLAGS='-fPIC' -j$(nproc) src/libwolfssl.la
 endef
 
 define $(package)_stage_cmds
diff --git a/depends/patches/libgmp/gcc-15.patch b/depends/patches/libgmp/gcc-15.patch
new file mode 100644
index 000000000..6b924f95e
--- /dev/null
+++ b/depends/patches/libgmp/gcc-15.patch
@@ -0,0 +1,105 @@
+diff --git a/acinclude.m4 b/acinclude.m4
+index bcc6f52..53705e1 100644
+--- a/acinclude.m4
++++ b/acinclude.m4
+@@ -602,24 +602,6 @@ int f ()
+ }
+ ])
+ 
+-GMP_PROG_CC_WORKS_PART([$1], [long long reliability test 1],
+-[/* The following provokes a segfault in the compiler on powerpc-apple-darwin.
+-   Extracted from tests/mpn/t-iord_u.c.  Causes Apple's gcc 3.3 build 1640 and
+-   1666 to segfault with e.g., -O2 -mpowerpc64.  */
+-
+-#if defined (__GNUC__) && ! defined (__cplusplus)
+-typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
+-void h(){}
+-static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+-{t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
+-void f(){static const struct{t1 n;t1 src[9];t1 want[9];}d[]={{1,{0},{1}},};t1 got[9];int i;
+-for(i=0;i<1;i++){if(e(got,got,9,d[i].n)==0)h();g(i,d[i].src,d[i].n,got,d[i].want,9);if(d[i].n)h();}}
+-#else
+-int dummy;
+-#endif
+-])
+-
+ GMP_PROG_CC_WORKS_PART([$1], [long long reliability test 2],
+ [/* The following provokes an internal compiler error on powerpc-apple-darwin.
+    Extracted from mpz/cfdiv_q_2exp.c.  Causes Apple's gcc 3.3 build 1640 and
+diff --git a/configure b/configure
+index b9abc1b..04ba451 100755
+--- a/configure
++++ b/configure
+@@ -6382,71 +6382,6 @@ fi
+ 
+ 
+ 
+-if test "$gmp_prog_cc_works" = yes; then
+-  # remove anything that might look like compiler output to our "||" expression
+-  rm -f conftest* a.out b.out a.exe a_out.exe
+-  cat >conftest.c <<EOF
+-/* The following provokes a segfault in the compiler on powerpc-apple-darwin.
+-   Extracted from tests/mpn/t-iord_u.c.  Causes Apple's gcc 3.3 build 1640 and
+-   1666 to segfault with e.g., -O2 -mpowerpc64.  */
+-
+-#if defined (__GNUC__) && ! defined (__cplusplus)
+-typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
+-void h(){}
+-static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+-{t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
+-void f(){static const struct{t1 n;t1 src[9];t1 want[9];}d[]={{1,{0},{1}},};t1 got[9];int i;
+-for(i=0;i<1;i++){if(e(got,got,9,d[i].n)==0)h();g(i,d[i].src,d[i].n,got,d[i].want,9);if(d[i].n)h();}}
+-#else
+-int dummy;
+-#endif
+-
+-int main () { return 0; }
+-EOF
+-  echo "Test compile: long long reliability test 1" >&5
+-  gmp_compile="$cc $cflags $cppflags conftest.c >&5"
+-  if { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$gmp_compile\""; } >&5
+-  (eval $gmp_compile) 2>&5
+-  ac_status=$?
+-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+-  test $ac_status = 0; }; then
+-    cc_works_part=yes
+-    if test "$cross_compiling" = no; then
+-      if { ac_try='./a.out || ./b.out || ./a.exe || ./a_out.exe || ./conftest'
+-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+-  (eval $ac_try) 2>&5
+-  ac_status=$?
+-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+-  test $ac_status = 0; }; }; then :;
+-      else
+-        cc_works_part=norun
+-      fi
+-    fi
+-  else
+-    cc_works_part=no
+-  fi
+-  if test "$cc_works_part" != yes; then
+-    echo "failed program was:" >&5
+-    cat conftest.c >&5
+-  fi
+-  rm -f conftest* a.out b.out a.exe a_out.exe
+-  case $cc_works_part in
+-    yes)
+-
+-      ;;
+-    no)
+-      gmp_prog_cc_works="no, long long reliability test 1"
+-      ;;
+-    norun)
+-      gmp_prog_cc_works="no, long long reliability test 1, program does not run"
+-      ;;
+-  esac
+-fi
+-
+-
+-
+-
+ if test "$gmp_prog_cc_works" = yes; then
+   # remove anything that might look like compiler output to our "||" expression
+   rm -f conftest* a.out b.out a.exe a_out.exe
diff --git a/src/Makefile.am b/src/Makefile.am
index d6ed7eb41..979df1a58 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,7 +5,7 @@
 DIST_SUBDIRS = secp256k1 univalue
 
 AM_LDFLAGS = $(PTHREAD_CFLAGS) $(LIBTOOL_LDFLAGS) $(SAN_LDFLAGS) $(HARDENED_LDFLAGS)
-AM_CXXFLAGS = $(SAN_CXXFLAGS) $(HARDENED_CXXFLAGS) $(ERROR_CXXFLAGS)
+AM_CXXFLAGS = $(SAN_CXXFLAGS) $(HARDENED_CXXFLAGS) $(ERROR_CXXFLAGS) -std=c++17
 AM_CPPFLAGS = $(HARDENED_CPPFLAGS)
 EXTRA_LIBRARIES =
 
@@ -594,7 +594,7 @@ libzcash_a_CPPFLAGS = -DMULTICORE -fopenmp -fPIC -DBOOST_SPIRIT_THREADSAFE -DHAV
 #libzcash_a_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 #libzcash_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) -DMONTGOMERY_OUTPUT
 
-libzcash_a_CXXFLAGS = $(SAN_CXXFLAGS) $(HARDENED_CXXFLAGS) -fwrapv -fno-strict-aliasing
+libzcash_a_CXXFLAGS = $(SAN_CXXFLAGS) $(HARDENED_CXXFLAGS) -fwrapv -fno-strict-aliasing -std=gnu17
 libzcash_a_LDFLAGS = $(SAN_LDFLAGS) $(HARDENED_LDFLAGS)
 libzcash_a_CPPFLAGS += -DMONTGOMERY_OUTPUT
 
@@ -636,7 +636,7 @@ libhush_a_SOURCES = \
 
 libhush_a_CPPFLAGS = -DMULTICORE -fopenmp -fPIC -DBINARY_OUTPUT -DCURVE_ALT_BN128 -DBOOST_SPIRIT_THREADSAFE -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS $(HARDENED_CPPFLAGS) -pipe -O1 -g  -Wstack-protector -fstack-protector-all -fPIE -fvisibility=hidden -DSTATIC $(BITCOIN_INCLUDES)
 
-libhush_a_CXXFLAGS = $(HARDENED_CXXFLAGS) -fwrapv -fno-strict-aliasing
+libhush_a_CXXFLAGS = $(HARDENED_CXXFLAGS) -fwrapv -fno-strict-aliasing -std=gnu17
 
 libhush_a_LDFLAGS = $(HARDENED_LDFLAGS)
 
diff --git a/src/hush/tlsmanager.cpp b/src/hush/tlsmanager.cpp
index 8b03445ce..dbfa9b006 100644
--- a/src/hush/tlsmanager.cpp
+++ b/src/hush/tlsmanager.cpp
@@ -301,7 +301,7 @@ WOLFSSL_CTX* TLSManager::initCtx(TLSContextType ctxType)
     bool bInitialized   = false;
     WOLFSSL_CTX* tlsCtx = NULL;
 
-    byte *pem;
+    unsigned char *pem;
     int plen = 0;
 
     if ((tlsCtx = wolfSSL_CTX_new(ctxType == SERVER_CONTEXT ? wolfTLSv1_3_server_method() : wolfTLSv1_3_client_method()))) {
diff --git a/src/net.h b/src/net.h
index 937f07ef1..fdc1984ce 100644
--- a/src/net.h
+++ b/src/net.h
@@ -51,7 +51,9 @@
 #undef TFM_TIMING_RESISTANT
 #define ECC_TIMING_RESISTANT 420
 #define TFM_TIMING_RESISTANT 420
+#define byte unsigned char
 #include <wolfssl/ssl.h>
+#undef byte
 
 class CAddrMan;
 class CBlockIndex;
diff --git a/util/build.sh b/util/build.sh
index deda1cbbf..7b9bb25ec 100755
--- a/util/build.sh
+++ b/util/build.sh
@@ -131,14 +131,13 @@ HOST="$HOST" BUILD="$BUILD" "$MAKE" "$@" -C ./depends/ V=1
 
 time ./autogen.sh
 
-# Default to gcc and g++ if not specified and use those compilers in config
-CC="${CC:-gcc}" CXX="${CXX:-g++}" CONFIG_SITE="$PWD/depends/$HOST/share/config.site" ./configure "$HARDENING_ARG" "$LCOV_ARG" "$TEST_ARG" "$MINING_ARG" $CONFIGURE_FLAGS "CC=$CC" "CXX=$CXX" CXXFLAGS='-g'
+CONFIG_SITE="$PWD/depends/$HOST/share/config.site" ./configure "$HARDENING_ARG" "$LCOV_ARG" "$TEST_ARG" "$MINING_ARG" $CONFIGURE_FLAGS CXXFLAGS='-g' CFLAGS='-std=gnu17'
 
 # Build CryptoConditions stuff
 WD=$PWD
 cd src/cc
 echo $PWD
-CC=${CC:-gcc} ./makecustom
+CFLAGS=-std=gnu17 CC=${CC:-gcc} ./makecustom
 cd $WD
 
 # Build RandomX